Optometry Notes

Medical Ethics and Professionalism, Optometry Notes, Optometry Semester 1

Ethical Professionalism and Informed Consent

OPTOMETRY · SEMESTER 1 Ethical Professionalism and Informed Consent Medical Ethics and Professionalism Read the consent, confidentiality and source corrections alongside these notes. START READING NOTES Contents of This Topic PRINCIPLE OF ETHICAL PROFESSIONALISM IN INFORMESD CONSENT TYPES OF CONSENTS 4.General Consent: SIGNIFICANT OF INFORMED CONSENT 4.Trust and Communication: The process builds a therapeutic alliance and transparency between patients and healthcare providers. INFORMED CONSET FOR MINORS AND ADOLESCENTS EXCEPTIONS TO CONSENT Ethical Professionalism and Informed Consent PRINCIPLE OF ETHICAL PROFESSIONALISM IN PROMOTING INFORMED CONSENT INFORMESD CONSENT is an ethical and legal process where a patient or research subject voluntarily agrees to a treatment, procedure, or study after understanding all relevant information. ELEMENTS (1) disclosure, (2) understanding, (3) voluntariness, (4) competence, and (5) consent TYPES OF CONSENTS 1.Written Consent (Signed Consent): Required for invasive, complex, or high-risk procedures (e.g., surgery, chemotherapy, anesthesia). It involves a signed document confirming the patient understands the details. 2.Verbal Consent (Oral Consent): Given spoken, for simpler, low-risk procedures or treatments. It is documented in the patient’s medical records. 3.Implied Consent (Action-based): Inferred by a patient's actions rather than words, such as holding out an arm for a blood pressure check or voluntarily entering an examination room. 4.General Consent: Typically obtained upon hospital admission, covering routine, low-risk, or daily care, distinct from specific, informed consent for individual procedures. 5.Electronic/Online Consent: A modern, digital form of written consent, often using digital signatures or clicking to accept, used in both clinical and research settings. SIGNIFICANT OF INFORMED CONSENT 1.Respect for Autonomy: It upholds the patient's right to self-determination, allowing them to make decisions about their own body. 2.Legal Protection: It is a legal obligation to prevent charges of battery (unauthorized touching) or malpractice, documenting that patients were informed. 3.Ethical Obligation: It is rooted in the ethical duty to do no harm and respect patients, ensuring they are not coerced. 4.Trust and Communication: The process builds a therapeutic alliance and transparency between patients and healthcare providers. 5.Patient Empowerment: It ensures patients are actively involved in their care decisions. INFORMED CONSET FOR MINORS AND ADOLESCENTS This is generally requires parental or guardian permission, alongside the child's "assent" (agreement) for research or treatment. This is the State regulations normally require the parents or guardians to give informed consent in place of minors, without considering the developmental changes in childhood and adolescence. EXCEPTIONS TO CONSENT Exceptions to informed consent allow medical treatment or research to proceed without standard, prior patient consent in specific, critical situations Ethical Professionalism and Informed Consent Emergency Situations (Life-Threatening): When immediate, life-saving care is needed (e.g., cardiac arrest, major trauma, stroke) and the patient is unable to consent, and no legal representative is available. Exception from Informed Consent (EFIC) Research: FDA regulations allow research on life-threatening conditions without consent if the patient is incapacitated, a prospect of direct benefit exists, and obtaining consent is not feasible. Therapeutic Privilege: A rarely used, legally contentious exception where a physician believes that disclosing information about risks would pose an immediate, serious psychological threat or harm to the patient. Ethical Professionalism and Informed Consent Patient Waiver: A competent patient may voluntarily decide to waive their right to informed consent, allowing the doctor to proceed with treatment. Incapacitated Patient: If a patient lacks the capacity to make decisions and no legal representative (proxy) is immediately available, treatment can be provided under the principle of implied consent. Minors in Emergencies: Parental or guardian consent is not required in emergency situations where a delay would cause serious, imminent harm to the child. ← PREVIOUS TOPICNEXT TOPIC →VIEW MODULE NOTESVIEW SEMESTER NOTESALL OPTOMETRY NOTES Need These Notes as PDF? Request a formatted copy for offline study, printing or revision. GET PDF NOTES ON WHATSAPP

Medical Ethics and Professionalism, Optometry Notes, Optometry Semester 1

Professional and Ethical Conduct

OPTOMETRY · SEMESTER 1 Professional and Ethical Conduct Medical Ethics and Professionalism Read the consent, confidentiality and source corrections alongside these notes. START READING NOTES Contents of This Topic PROFESSIONAL CONDUCT CORE PRINCIPLES OF PROFESSIONAL CONDUCT ETHICAL CONDUCT PRINCIPLE OF ETHICAL AND PROFESSIONAL CONDUCT VALUE 5.confidentiality IMPORTANCES OF PROFESSIONAL CONDUCT IN OPTOMETRY PROFFESSIONAL AND ETHICAL CONDUCT PROFESSIONAL CONDUCT set of attitude , behaviour , and characteristics deemed desirable in member of profession. shows the relation ship between member and society . CORE PRINCIPLES OF PROFESSIONAL CONDUCT 1.Integrity and honesty 2.competence and deligance 3.accountability and responsibility 4.cofidentiality 5.respect ETHICAL CONDUCT act with integrity ,honestly,fairness and responsibility guide by moral principle to what is right for individuals and society. PRINCIPLE OF ETHICAL AND PROFESSIONAL CONDUCT VALUE 1.honest and intergrity actiong truthfully and ethically even when its difficult. 2.accountability and responsibility take actions,decisions and outcomes to stuation. 3.respect valuing colleageous,client and deverse experiences and treating all with diginity 4.competence derivering high quality work ,maintaining skills and acting within one scope 5.confidentiality protecting sensitive information 6.fairness and impartiality treating people equitably and without bias 7.transparency being open and honest in dealing 8.commitment dedication to professional duties and standards IMPORTANCES OF PROFESSIONAL CONDUCT IN OPTOMETRY 1. buld trust ethical conduct fosters strong trusting patients professional relationship 2.ensures of safety competence and honesty minimize harm and ensure appropriate care and referral 3.upholds reputation maintain public faith inthe otometry professional as whole 4.guides decision provide the frame work for navigating complex ethical dilemmas 5.legal and regulartory complience meet legal recquirements for record keeping,privecy and professional standard ← PREVIOUS TOPICNEXT TOPIC →VIEW MODULE NOTESVIEW SEMESTER NOTESALL OPTOMETRY NOTES Need These Notes as PDF? Request a formatted copy for offline study, printing or revision. GET PDF NOTES ON WHATSAPP

Medical Ethics and Professionalism, Optometry Notes, Optometry Semester 1

Ethics and Professional Conduct in Medical Practice

OPTOMETRY · SEMESTER 1 Ethics and Professional Conduct in Medical Practice Medical Ethics and Professionalism Read the consent, confidentiality and source corrections alongside these notes. START READING NOTES Contents of This Topic Outline At the end one should be able to:- Code Of Ethics For Medical Profession Ethics and Professional Conduct in Medical Practice NOTE Code Of Ethics For Medical Profession Cont.’ History in brief The principles of ethics are inspirational goals and attributes of the professions. Principles Of Ethics And Code Of Professional Conduct For Medical Practitioners 1. Beneficence (Do Good) It requires that:- One should not worsen any human being’s situation; The practitioner shall:­ Have the duty to give emergency care until he is sure that others are willing to give such care; 2. Non-maleficence (Do No Harm) The practitioner shall:- Strive to have adequate standard equipment and necessary supplies for practice; Not permit oneself or herself to be exploited in a manner which is undesirable to the public or professional interest; 3. Autonomy (Self Determination) The provider shall:- Note that: The client has the right to choose a practitioner, who will attend the 4. Justice (Fairness) Justice is commonly conceptualized as Distributive or Commutative. Distributive Justice Commutative Justice Veracity (Truthfulness) and Fidelity (Faithfulness/ Loyalty) The practitioner shall: ETHICS AND PROFESSIONALISM IN MEDICAL PRACTICE Outline Code of ethics for medical profession Principles of Ethics and Code of Professional Conduct for medical practitioners At the end one should be able to:- Describe the code of ethics for medical profession Describe principles of ethics and Code of Professional Conduct for medical practitioners Code Of Ethics For Medical Profession Definition of code of ethics A statement encompassing the set of rules based on values and the standards of conduct to which practitioners of a profession are expected to conform. A standard of conduct deep-rooted in commitment, confidentiality, and relationships. With regards to medical profession it is meant for medical practitioners Ethics and Professional Conduct in Medical Practice Committed to performance improvement and maintaining integrity, personal accountability and moral obligation to all customers served—clients, employees, employers, physicians, organizations, and the public. Professionals promote the dignity of the profession and are committed to practicing the profession with honesty, integrity, and accountability, respecting all laws and refusing to participate in or conceal any unethical, false, fraudulent, or deceptive activity Code Of Ethics For Medical Profession Cont.’ NOTE The true professionalism in medicine will al ways put in first place the well-being of the patient and the community as principal objective. Code Of Ethics For Medical Profession Cont.’ Code Of Ethics For Medical Profession Cont.’ Altruism: Clinician is obligated to attend to the best interest of patients, rather than self-interest. ƒ Accountability: Clinicians are accountable to their patients, to society on issues of public health, and to their profession. ƒ Excellence: Clinicians are obligated to make a commitment to life-long learning. ƒDuty: Clinicians should be available and responsive when ‘on call,’ accepting a commitment to service within the profession and the community. Code Of Ethics For Medical Profession Cont.’ Honour and integrity: Clinicians should be committed to being fair, truthful and straightforward in their interactions with patients and the profession. ƒRespect for others: A Clinician should demonstrate respect for patients and their families, other physicians and team members, medical students, residents and fellows. ƒThese values should provide guidance for promoting professional behaviour and for making difficult ethical decisions. History in brief The Principles of Ethics and Code of Professional Conduct, have their roots In Greece', way back in 500 B.C and traceable to the emergence of Hippocrates (460B.C.) and his philosophy in scientific approaches in medicine and principles on moral and ethical requirement of an ideal physician. Code Of Ethics For Medical Profession Cont.’ History in brief The principles, which were then summarized in the form of "Hippocratic oath", were the fundamental governance of the medical and dental professions. Existed throughout history until when they were officially modified by the Geneva Convention in 1948, which then formed the basis for diverse ethical approaches Code Of Ethics For Medical Profession Cont.’ The principles of ethics are inspirational goals and attributes of the professions. They provide guidance and other justification for the professional conduct. Code Of Ethics For Medical Profession Cont.’ Ethics and Professional Conduct in Medical Practice The Principles can overlap each other as well as compete with each other for priority as one principle can justify a given element of the code of professional conduct and may at times, need to be balanced against each other. Otherwise the principles are the profession‘s firm guideposts. Code Of Ethics For Medical Profession Cont..'’ Ethics and Professional Conduct in Medical Practice Notably, ethics attained in the principles closely relate to the law but are not the same I', and often do exceed legal duties. For that matter, in resolving any ethical problem not explicitly covered by the code, both practitioners and clients shall consider the ethical principles, client's need and interests with respect to the applicable law. Code Of Ethics For Medical Profession Cont..’ Principles Of Ethics And Code Of Professional Conduct For Medical Practitioners The Principles of Ethics and Code of Professional Conduct for medical and dental practitioners in Tanzania are therefore epitomized and presented into five cardinal principles Beneficence Non maleficence Autonomy Justice and Veracity and Fidelity 1. Beneficence (Do Good) Beneficence is one of the moral principles of medical practice. The principle of beneficence refers to positive acts that lead to the welfare of others and a client in particular. It implores that a practitioner has to do all he can to promote good, kindness or generosity, and it implies acts of humanity, mercy or charity. It is a moral obligation required from the practitioner to act for the benefit of others. Ethics and Professional Conduct in Medical Practice It holds that one should help others further their important and legitimate interests as those persons understand them, or as one conceives them to be. One is obliged to act to benefit others when one

Medical Ethics and Professionalism, Optometry Notes, Optometry Semester 1

Relationship Between Optometrist And Society In Providing Eye Care Services

OPTOMETRY · SEMESTER 1 Relationship Between Optometrist And Society In Providing Eye Care Services Medical Ethics and Professionalism Read the consent, confidentiality and source corrections alongside these notes. START READING NOTES Contents of This Topic PROFESSIONAL PERSONAL OBLIGATION TO SOCIETY CORE COMPONENT OF PROFESSOPNAL OBLIGATION DUAL LOYALITY CHALLENGES OF DUAL LOYALITY RESOURCE ALLOCATION CHALLENGES OF RESOURCE ALLOCATION 2: Lack of Real-Time Visibility into Resource Availability 3: Lack of Real-Time Visibility into Resource Availability 4: Poor Capacity Planning and Forecasting 5: Inadequate Resource Management Tools and Processes 6: Conflicting Project Priorities CLINICIAN ETHICAL RESPONSIBILITY IN PUPLIC Relationship Between Optometrist And Society In Providing Eye Care Services HEALTH PERSONNELS RESPONSIBILITY FOR HIS/HER OWN ACTION IMPORTANCES OF WORKERS TAKING RESPONSIBILITY FOR THEIR OWN ACTION Trust & Communication: Builds a foundation of trust, leading to better communication and confidence in delegating tasks. HOW CAN HEALTH PERSONNEL TAKE ACTION RESPONSIBILITY FOR OWN ACTION RELATIONSHIP BETWEEN OPTOMETRIST AND SOCIETY IN PROVIDING EYE CARE SERVICES PROFESSIONAL PERSONAL OBLIGATION TO SOCIETY this is representation of intersection of ethical duties and personal integrity,requiring individual to uphold high standard of conduct, accountability and competence in thier professional roles. key components honesty, confidentiality,competence,legal complience, therefore these obligations demands a commitiment to continuous learning and ethical decision making . CORE COMPONENT OF PROFESSOPNAL OBLIGATION 1.accountability and integrity 2.confidentiality and privecy 3.competence and skill development 4.ethical conduct 5.complience.. adharence to laws and reguration and policies. DUAL LOYALITY Dual loyalty is the potential conflict between clinicians’ duties to their patients and their obligations to their employers, particularly governments. Are conflicts between health care professionals’ obligations toward their patients and third-party interests. Example, a doctor who is asked by a government to assess a prisoner's fitness to withstand torture faces an enormous ethical dilemma because of the competing loyalties of the doctor to the state versus the physician's code of ethics and his/her commitment to a patient's human rights. CHALLENGES OF DUAL LOYALITY 1. institutional and organizational entities. 2.legal and regulatory guidelines. 3. ethical and moral responsibilities. 4.social and public responsibilities and other individuals. RESOURCE ALLOCATION is the strategic distribution and management of resources—including human resources, physical resources, financial resources and technological resources—across organizational initiatives, portfolios and departments. CHALLENGES OF RESOURCE ALLOCATION 1: Unbalanced Workload Distribution One of the most prevalent and damaging resource allocation problems is uneven workload distribution, where some team members are overwhelmed with tasks while others with comparable skills remain underutilized. 2: Lack of Real-Time Visibility into Resource Availability visibility remains one of the most significant challenges in resource management. Despite technological advances, 42% of organizations identify lack of visibility into resource availability as a primary inhibitor to effective resource management. 3: Lack of Real-Time Visibility into Resource Availability assigning resources based solely on availability rather than competency creates a cascade of problems that undermine project quality and team satisfaction. The skills mismatch problem occurs when tasks are assigned to team members who lack the appropriate expertise or, conversely, when highly skilled professionals are assigned to tasks below their competency level. 4: Poor Capacity Planning and Forecasting Capacity planning, the ability to predict future resource needs and align them with anticipated demand, consistently ranks as the biggest challenge in resource management 5: Inadequate Resource Management Tools and Processes Despite the availability of sophisticated resource management platforms, many organizations continue to rely on inadequate tools that cannot support effective allocation decisions. 6: Conflicting Project Priorities In multi-project environments, one of the most challenging resource allocation problems is managing conflicting priorities across concurrent initiatives. When multiple projects compete for the same limited resources, allocation decisions become complex tradeoffs that can derail multiple initiatives simultaneously. CLINICIAN ETHICAL RESPONSIBILITY IN PUPLIC Public Health Advocacy: Educate patients and the public, support preventative measures (like vaccination programs), and ensure access to essential services. Confidentiality & Privacy: Protect personal health information, even when sharing data for public health reporting, advocating for high standards. Scientific Integrity: Base actions and recommendations on sound science, ensuring interventions are evidence-based. Relationship Between Optometrist And Society In Providing Eye Care Services Honesty & Transparency: Deal honestly with patients about their health and be transparent about public health policies and decisions. Balancing Duties: Navigate conflicts between individual patient needs and broader community health, such as during infectious disease outbreaks. HEALTH PERSONNELS RESPONSIBILITY FOR HIS/HER OWN ACTION Legal Duty of Care: Healthcare workers have a legal obligation to provide a standard of care that is reasonable and safe for their patients. Failure to act, or acting in a way that causes harm (neglect or malpractice), can lead to legal liability and prosecution. Ethical Obligations: Professional codes of ethics (such as those from the American Nurses Association) outline an inherent moral duty to act in the best interest of the patient, minimize harm (non-maleficence), and respect patient autonomy. Accountability: Professionals are accountable to their regulatory bodies, employers, colleagues, and patients for their conduct and performance. This means they must be able to justify their decisions and actions. Relationship Between Optometrist And Society In Providing Eye Care Services Competence and Professional Development: A core responsibility is to work within one's scope of knowledge and abilities and engage in continuous professional development to maintain competence. Documentation and Communication: Accurate and timely record-keeping, as well as effective communication with patients and the wider healthcare team, is crucial for coordinated and safe care, and falls under individual responsibility. Personal Well-being and Self-Care: Healthcare personnel also have a professional responsibility to take reasonable care of their own health and well-being to ensure they are fit to practice and do not compromise patient care through burnout or impairment. IMPORTANCES OF WORKERS TAKING RESPONSIBILITY FOR THEIR OWN ACTION Personal Growth & Empowerment: Encourages self-reflection, develops skills, builds resilience, and gives a sense of control over one's path. Career Advancement: Demonstrates leadership potential, trustworthiness, and reliability, opening doors for promotions. Integrity & Respect: Shows honesty, character, and commitment, earning respect from colleagues and leaders. Trust & Communication: Builds a foundation of trust, leading to better communication and confidence in delegating tasks. Productivity &

Medical Ethics and Professionalism, Optometry Notes, Optometry Semester 1

Resolving Conflicts

OPTOMETRY · SEMESTER 1 Resolving Conflicts Medical Ethics and Professionalism Read the consent, confidentiality and source corrections alongside these notes. START READING NOTES Contents of This Topic Explain principles of customer care Explain the techniques used in providing quality customer care Outline the importance of first impression customer service Explain the steps needed to begin problem solving in the customer care Show how patient’s conflicts are resolved CUSTOMER CARE SKILLS IN RESOLVING CONFLICTS AND ADDRESSING PATIENT’S COMPLAINTS Explain principles of customer care Principles of customer care in healthcare, particularly optometry, guide interactions to prioritize patient well-being, trust, and satisfaction while resolving conflicts. Core principles include: Patient-Centered Approach — Focus on the patient's needs, emotions, and perspectives first. Empathy and Respect — Treat patients with dignity, acknowledging their feelings without judgment. Professionalism — Maintain ethical standards, confidentiality, and competence. Effective Communication — Clear, honest, and active listening to avoid misunderstandings. Accountability — Take ownership of issues and commit to resolutions. Fairness and Transparency — Provide accurate information and equitable treatment. Proactivity — Anticipate needs and prevent escalations. These principles turn potential conflicts into opportunities for stronger relationships. Explain the techniques used in providing quality customer care Techniques for quality customer care emphasize de-escalation and resolution: Active Listening → Fully concentrate, nod, and paraphrase to show understanding. Empathy Statements → "I can see this has been frustrating for you." Apologizing Sincerely → "I'm sorry for the inconvenience this has caused," without admitting fault unnecessarily. Remaining Calm and Professional → Use a steady tone and open body language. Asking Open-Ended Questions → To uncover root causes. Offering Solutions → Provide options and involve the patient in decisions. Documentation and Follow-Up → Record details and check back on resolution. These techniques build rapport and resolve issues efficiently. Outline the importance of first impression customer service First impressions form within seconds and significantly impact patient trust and conflict likelihood: Sets the tone for the entire visit; a positive one reduces anxiety and complaints. Builds immediate trust; patients are more forgiving of later issues if welcomed warmly. Influences retention and referrals; 70-80% of patients decide on return visits based on initial interactions. Prevents escalation; a poor impression (e.g., rude reception) amplifies minor issues. Enhances perceived quality of care, even before clinical interaction. In optometry, a smiling greeting and efficient check-in can turn a nervous patient into a loyal one. Explain the steps needed to begin problem solving in the customer care Initial steps focus on de-escalation and understanding: Stay Calm and Composed — Maintain neutral body language to avoid defensiveness. Listen Actively Without Interrupting — Allow the patient to fully express their complaint. Acknowledge and Empathize — Validate feelings: "I understand why you're upset." Apologize Appropriately — For the experience, not necessarily fault. Clarify the Issue — Ask questions to gather facts. Take Ownership — Move to private area if needed and involve appropriate staff. These steps prevent escalation and lay groundwork for resolution. Show how patient’s conflicts are resolved Use the HEARD technique (Hear, Empathize, Apologize, Resolve, Diagnose) for effective resolution: Scenario 1: Complaint about long wait time Patient: "I've been waiting 45 minutes!" Staff: Hears fully → "I'm sorry you've had to wait so long—that must be frustrating." (Empathize/Apologize) → Explains delay briefly → Offers priority seating or compensation (e.g., waiver of co-pay). → Follows up post-visit. Scenario 2: Wrong prescription in glasses Patient returns upset. Optometrist: Listens → "I can imagine how inconvenient blurry vision has been." → Apologizes → Re-examines free of charge, expedites new lenses → Provides loaner glasses and follow-up call. Scenario 3: Perceived rude staff Manager: Privately hears complaint → Validates feelings → Apologizes on behalf of practice → Coaches staff → Offers goodwill gesture (discount on next visit) → Surveys for feedback. Resolution turns complainants into advocates when handled promptly and empathetically. ← PREVIOUS TOPICNEXT TOPIC →VIEW MODULE NOTESVIEW SEMESTER NOTESALL OPTOMETRY NOTES Need These Notes as PDF? Request a formatted copy for offline study, printing or revision. GET PDF NOTES ON WHATSAPP

Medical Ethics and Professionalism, Optometry Notes, Optometry Semester 1

Additional Study Notes: Consent, Confidentiality and Source Corrections

OPTOMETRY · SEMESTER 1 Additional Study Notes: Consent, Confidentiality and Source Corrections Medical Ethics and Professionalism Additional Study Notes — newly authored explanations and examples. These sections supplement the supplied course material. START READING NOTES Contents of This Topic Learning objectives Professional principles Corrections to ambiguous source wording An original consent discussion framework Learning objectives Apply consent and confidentiality principles to an eye-care encounter and identify unsafe wording in older teaching notes. Professional principles The UK General Optical Council’s standards emphasise patient-centred decisions, effective communication, valid consent, appropriate records, confidentiality, competence and referral. They are a comparative professional reference, not a statement of Tanzanian law. Local legal requirements and the relevant regulator remain the authority for practice. Corrections to ambiguous source wording The supplied Medical Ethics 2 slides say that a physician “should not render help regardless” of financial ability, ethnicity or religion. This wording is contradictory. The intended professional principle is equitable care without discriminatory refusal; learners should not use the source sentence as a rule for withholding help. The same slides describe withholding care information from the patient as “ethical”. This should not be taught as a general rule. Information should be communicated honestly, with appropriate explanations and lawful handling of confidential information. Several supplied notes equate inability to consent with obtaining consent from the next of kin. A relative’s relationship alone does not automatically establish legal authority to consent for another person. Follow the applicable law, decision-specific capacity assessment, emergency provisions and institutional procedures. An original consent discussion framework Explain the purpose of the proposed examination in plain language. Describe the relevant steps, expected benefits, material risks, alternatives and the option to decline. Invite questions and check understanding. Ensure the decision is voluntary and document the discussion in proportion to the intervention. If communication is difficult, adapt the explanation and use appropriate communication support. Communication difficulty is not itself proof of incapacity. When uncertainty about authority or capacity matters to a proposed intervention, obtain appropriate senior or legal guidance through the service. Study References General Optical Council: Standards of Practice WHO: Human rights and health Source notes: Medical Ethics 2 and Professional and Ethical Conduct College of Optometrists: Consent External references checked 13 September 2026. Worked numerical examples and teaching activities are original. ← PREVIOUS TOPICVIEW MODULE NOTESVIEW SEMESTER NOTESALL OPTOMETRY NOTES Need These Notes as PDF? Request a formatted copy for offline study, printing or revision. GET PDF NOTES ON WHATSAPP

Ophthalmic Dispensing Theory, Optometry Notes, Optometry Semester 1

Ophthalmic Lenses Lecture 1

OPTOMETRY · SEMESTER 1 Ophthalmic Lenses Lecture 1 Ophthalmic Dispensing Theory START READING NOTES Contents of This Topic Ophthalmic Lenses Lecture 1 To understand the way light behaves for lenses we need to look at the nature of light itself. Note: The greater the amplitude the greater the intensity of the light. The wavelength of light that are visible to the human eye vary in length from 380 to 760nm. Reflection Angle of reflection; Angle at which the ray is reflected. 2. Speed of light and refractive index The medium of less resistance is called rarer and the medium of more resistance is called denser medium. Refractive index =speed of light in vacuum/speed of light in a new substance. 3. Refraction. Snell‘s Law. Given, n =1 (refractive index of air) 4. Dispersion (white light split into its constituent colors). OPHTHALMIC LENSES Ophthalmic Lenses Lecture 1 An understanding of lens optics begins with basic study of the action of a single ray of light and how it is affected when passing into or through a transparent optical surface. INTRODUCTION… To understand the way light behaves for lenses we need to look at the nature of light itself. When light travel it behaves in two ways, Like a wave generated by dropping a rock into a pond. As a particle or photon. THEORY OF LIGHT For our purposes, we can best understand light as a wave. Deflining light wave Note: The greater the amplitude the greater the intensity of the light. As wavelength changes, so does the perceived color of the light. The wavelength of light that are visible to the human eye vary in length from 380 to 760nm. Color of high or largest wavelength is more seen than with the short wavelength. Red (620-760), orange (590-620), yellow (560-590), green (490-560), blue (450-490) and violet (380-450). These are only a small part of the electromagnetic spectrum. The visible spectrum Reflection Is the bouncing back of light rays when interrupted on its path at an angle. Angle of incidence(i) ; The angle at which the light strikes the surface. Measured from a line perpendicular to the reflecting surface at the point of reflection known as the normal to the surface. Properties of light Angle of reflection; Angle at which the ray is reflected. ie i = r 2. Speed of light and refractive index Light is able to travel faster through some material than through others. Travels more faster in a vacuum , because there is nothing to resist than other medias. Speed of light in a vacuum is 3×10*8m/s . The medium of less resistance is called rarer and the medium of more resistance is called denser medium. The amount of resistance to the speed of light that slows it down is called Refractive Index. Note; The more the material slows the passage of light , the higher is its refractive index. Refractive index =speed of light in vacuum/speed of light in a new substance. The refractive index is always greater than one , the speed in the denominator is always slower and smaller number. 3. Refraction. Happens when light strikes a new transparent medium straight , the light slows down , but continues on the same direction. When light strikes a new substance , the change in speed in the new media causes the light to change direction. Ophthalmic Lenses Lecture 1 Note ; when light travel from a rarer media to denser media the direction of the refraction is towards the normal to the surface and vice versa. Snell‘s Law. If the refractive index of both media through which light is travelling are known, the angle of refraction for a given angle of incidence is predictable. Mathematically, nsini=n’sinr Given, n =1 (refractive index of air) n’= 1.523 (refractive index of glass) I = 30degrees r= ? d= ? Example, 4. Dispersion (white light split into its constituent colors). 5. Diffraction 6. Interference 7. polarization. 8. Dual nature (both wave and particles) 9. Absorption and transmission. Other properties of light. Introduction to ophthalmic lenses. NEXT TOPIC →VIEW MODULE NOTESVIEW SEMESTER NOTESALL OPTOMETRY NOTES Need These Notes as PDF? Request a formatted copy for offline study, printing or revision. GET PDF NOTES ON WHATSAPP

Ophthalmic Dispensing Theory, Optometry Notes, Optometry Semester 1

Types Of Ophthalmic Lenses Lecture 3

OPTOMETRY · SEMESTER 1 Types Of Ophthalmic Lenses Lecture 3 Ophthalmic Dispensing Theory START READING NOTES Contents of This Topic There are two main types of ophthalmic lenses these are] Types Of Ophthalmic Lenses Lecture 3 Optical properties of converging lens] Object beyond 2f – real, inverted , diminished image( btn f and 2f) Correction of hypermetropia Has negative (-) power Always forms a virtual , erect , and diminished image , regardless of object position. Correction of myopia TYPES OF OPHTHALMIC LENSES AND MATERIALS. There are two main types of ophthalmic lenses these are] Convex lens ( converging lens). Concave lens (diverging lens). OPHTHALMIC LENSES Types Of Ophthalmic Lenses Lecture 3 Is thicker at the centre and thinner at the edges. It converges (brings together) parallel rays of light to a point called principal focus. Convex lens Optical properties of converging lens] Has positive (+) power Focal length is positive Converges light rays ‘light is diplaced towards the base when pass through the prism. Object beyond 2f – real, inverted , diminished image( btn f and 2f) Object at 2f – real, inverted , same size. (at 2f) Object btn f and 2f – real, inverted , magnified (beyond 2f) Object at f – image at infinity Object btn f and optical center – virtual , erect , magnified. Image formation on convex lens. Correction of hypermetropia Near vision correction in presbyopia. Used in magnifiers, reading glasses, and optical instruments. Uses of convex lenses Types Of Ophthalmic Lenses Lecture 3 Is the thinner at the center and thicker at the edges. It diverges (spreads out) parallel rays of light, making them appear to come from virtual focus. Concave lens Has negative (-) power Focal length is negative Diverges light rays Optical properties Always forms a virtual , erect , and diminished image , regardless of object position. Image formation on concave lens Correction of myopia Uses of concave lens Key differences OPHTHALMIC LENS MATERIALS ← PREVIOUS TOPICNEXT TOPIC →VIEW MODULE NOTESVIEW SEMESTER NOTESALL OPTOMETRY NOTES Need These Notes as PDF? Request a formatted copy for offline study, printing or revision. GET PDF NOTES ON WHATSAPP

Ophthalmic Dispensing Theory, Optometry Notes, Optometry Semester 1

Lens Materials and Their Properties

OPTOMETRY · SEMESTER 1 Lens Materials and Their Properties Ophthalmic Dispensing Theory START READING NOTES Contents of This Topic _ LENS MATERIAL & What is an Ophthalmic Lens ? LENS MATERIAL NATURAL NATURAL MEDIA , ° Clear natural crystals comparisons between glass & Glass lenses GLASS LENS MATERIAL DVIRES CROWN |} CROWN GLASS Wy) ¢ R.A- 1.523 ADVANTAGES * Low in costs DISADVANTAGES FLINT GLASS dense flint ADVANTAGE DISADVANTAGE BARIUM CROWN GLASS TYRES Refractive |Abbe Specific HIGH INDEX GLASS PLASTIC LENS MATERIAL CR – 39 * CR stands for Columbia Resin & it is 39% ¢ For years CR- 39 was used without anti ) * CR-39 plastic lenses do not fog up as i, * Refractive index : 1.498 ", ¢ The material is highly impact resistant and characteristics Disadvantages POLYCARBONATE History i] ¢ RL: 1.586 ¢ Very soft material — low scratch resistance ZIESS DURALATE LENSES ° High index plastics Refractive | Abbe value | Specific POLY METHA Properties of PMMA Trivex i, * Refractive index : 1.532 POLARIZED LENS Tinted lens A tinted lens could be available in:- Glass CR-39 Polycarbonat =) ; rT OPTICAL PROPERTIES Abbe number ¢ Abbe number of 60 is considered to have ¢ The amount of prism created together with REPEECTANCE , * The reflectance of the lens surface is , * The higher the refractive index, the greater Refractive Index i, * n= Velocity of light in air ABSORPTION ¢ Absorption of an ophthalmic lens generally Specific gravity Impact resistance Drop ball test for impact SCRATCH RESISTANCE ¢ Lenses may be dipped, or a thin layer of ELECTRICAL PROPERTIES CHEMICAL PROPERTIES THERMAL PROPERTIES * Therefore, a hypothetical ideal lens ¢ Unfortunately, there is no lens material that _ LENS MATERIAL & IT’S . \ PROPERTIES What is an Ophthalmic Lens ? , * It is the portion of the transparent medium bounded by 2 refracting surfaces at least | of which is curved. LENS MATERIAL , * Ophthalmic lens materials means all materials used during manufacturing, i.e. all materials entered into the composition of the basic ophthalmic lens. ji # * There are three types of lens material. } + (1) NATURAL MEDIA * (2) GLASS > * (3)PLASTIC NATURAL MEDIA GLASS PLASTIC NATURAL MEDIA ) * Quartz or rock made out of pure silica was exclusively used property made it ideal for spectacle lens s * Not used in optical instruments since it is doubly refracting material , ° Clear natural crystals of quartz are very rare to find ? « So their use is almost stopped comparisons between glass & plastic Glass lenses Plastic lenses f° Heavy * Light weight Low impact resistant ¢ High impact resistant Scratch resistant * Highly Scratch resistant Cheaper * Costlier 3 piece can’t be use * 3 piece can be use Not proffered for children * good proffered for children Glass lenses Less transmission Aberration is low Higher tendency to fog More affected It not necessary required coating Plastic lenses 2% greater transmission Aberration is high Lower tendency to fog Less affected must necessary required coating GLASS LENS MATERIAL ', * Amorphous compound ¢ Super cooled liquid J * Becomes softer & loses viscosity when heated © * No specific melting point DVIRES ° CROWN GLASS BARIUM CROWN GLASS FLINT GLASS HIGH INDEX GLASS ° 10 CROWN |} GLASS BARIUM HIGH CROWN INDEX GLASS GLASS CROWN GLASS ) * 70 % Silica , 14- 16 % sodium oxide , 11- 13 % calcium oxide and small percentage of potassium , borax , antimony , arsenic ( * Used for single vision. ji * * Distant portion of bifocal, trifocal. ¢ Most widely used in ophthalmic industry. Wy) ¢ R.A- 1.523 ¢ Abbe value – 59 § * Specific gravity — 2.54 * Transparency – 91.6% C ¢ U.V. absorption — 280 nm ADVANTAGES i Highly scratch resistant ¢ Resistant to solvents & temperature fluctuation ‘ ¢ Tinted by vaccum coating © * Good optical qualities ¢ High range curves blanks & addition available , * Available in photochromic sunglass option |, * Low in costs * Produce least amount of chromatic aberration * Blanks available in all sizes DISADVANTAGES ij, * Low impact resistance ¢ Heavier material § * Chips can easily form while edging & handling © ¢ Not appropriate for children & sport wear ¢ U.V. absorption not 100 % (upto 280nm) FLINT GLASS if, * Ingredients:- 45-65% lead oxide 25-45% silica 10% soda + potassium oxide dense flint Refractive |Abbe Specific index value gravity Dense flint | 1.649 33.8 3.90 | Extra 1.69 30.9 4.23 | ADVANTAGE i, * Used in kryptok bifocal * High prescription DISADVANTAGE i, * High dispersion ¢ High specific gravity § * Transparency less than crown glass BARIUM CROWN GLASS , * 25—40 % barium oxide * 30 % Silica Lime , zinc , aluminum , boron , zirconium TYRES LIGHT BARIUM CROWN GLASS DENSE BARIUM CROWN GLASS 23 Refractive |Abbe Specific index value gravity E573) 57.4 S22 1.616 55.1 3.36 24 ADVANTAGE , * High RI with out an appreciable increase in chromatic dispersion DISADVANTAGE i, * Chromatic dispersion more than crown glass HIGH INDEX GLASS ¢ Any lens having Refractive Index (RI) higher than 1.523 in glass is called high index lens * Available in 1.6, 1.7,1.8,& 19) * Contents- high % of Titanium oxide * Transmission- less than 92% * Useful for reducing the thickness for high powered lenses 2 PLASTIC LENS MATERIAL ¢ Organic substances based on molecular frame work of carbon with H, N, O | 4 °* Superior to glass in many aspects except their softness = * They are comparatively more attractive * Can be easily tinted for cosmetic appeal and sun wear PLASTIC LENS MATERIAL ¢Itisa polymeric material of large molecular wt. which can be shaped by flow formed by combining various organic ingredients with inorganic materials such as carbon, hydrogen, ,nitrogen, chlorine & Sulphur. PLASTIC LENS MATERIAL TYPES CR – 39 | * It is

Ophthalmic Dispensing Theory, Optometry Notes, Optometry Semester 1

Components Of Ophthalmic Lenses Used In Visual Correction

OPTOMETRY · SEMESTER 1 Components Of Ophthalmic Lenses Used In Visual Correction Ophthalmic Dispensing Theory START READING NOTES Contents of This Topic LEARNING OBJECTIVES BIFOCAL LENS DESIGN Description of bifocal lens design Types of Bifocal Lenses Flat-Top (D-shaped) Segments Round Segments Curve-Top and Panoptik Segments Who Can Benefit from Bifocal Lenses? Multitaskers Instructions for new bifocal wearers 2. How to Look Through the Lenses 3. Safety and Movement 4. Adjusting Habits EFFECTIVE POWER Components Of Ophthalmic Lenses Used In Visual Correction Key Factors Affecting Effective Power LENS POWER AND THICKNESS Lens Thickness OPHTHALMIC PRISMS Parts of ophthalmic prisms How it Works Uses of ophthalmic prisms Therapeutic Uses: LENS TRANSPOSITION How to Transpose a Prescription (Simple Transposition) Example The Toric Transposition Formula Step-by-Step Rules COMPONENTS OF OPHTHALMIC LENSES USED IN VISUAL CORRECTION LEARNING OBJECTIVES At the end of this session student should be able to: Describe Bifocal lens design Explain effective power Describe lens power and thickness Describe ophthalmic prisms Explain lens transposition BIFOCAL LENS DESIGN What Are Bifocal Lenses? Bifocal lenses incorporate two different optical powers within the same lens to correct vision for both distance and near tasks. This dual functionality eliminates the need for switching between multiple pairs of glasses, making them a practical and convenient choice for many people. Description of bifocal lens design Bifocal lenses feature a distance prescription in the upper portion of the lens and a near prescription in the lower segment. This design allows wearers to focus clearly on objects far away or close up without removing or changing their glasses. How Bifocal Lenses Work The lens is divided by a visible segment line separating two areas of different lens powers. Above the line, the lens corrects distance vision. Below the line, the lens curvature changes for near-vision tasks such as reading. The optical power transition helps your eyes shift focus smoothly between these two zones. Types of Bifocal Lenses The basic styles include Round segments Flat-top segments Curved-top segments Panoptik Segments Executive-style segments or Franklin Flat-Top (D-shaped) Segments Also called 'half eyes,' these lenses have a D-shaped reading segment at the bottom of the lens. They provide a broad reading area with a clearly defined boundary, popular among those who want clear separation of vision zones and do not mind a visible segment line. Round Segments Round bifocal lenses feature a circular reading segment that tends to be less conspicuous but generally offers a smaller near-vision area. These are favored by individuals who prioritize cosmetics and a less noticeable lens design. Executive Segments Executive bifocals have a full-width horizontal segment at the bottom of the lens that provides a large near viewing area, ideal for extensive reading or detailed work. These lenses tend to be thicker and can be heavier, but they maximize your reading zone Fig. round segment Curve-Top and Panoptik Segments Curve-top segments look similar to fl at tops, except that the upper line is arched, rather than fl at. There is a dis tinct point on either corner. The top of panoptik seg ments are curved as well, but the corners are rounded Who Can Benefit from Bifocal Lenses? Bifocal lenses are primarily intended for those experiencing presbyopia or who require simultaneous correction for distance and near vision. They suit people whose lifestyles demand frequent focusing between different visual ranges. Presbyopia Presbyopia is a normal, age-related change in the eye's lens elasticity that makes close-up vision more difficult. It usually begins in the early to mid-40s and affects nearly everyone, leading to a need for reading magnification. This natural change is not a disease and does not mean your eyesight is failing. Multitaskers Individuals who switch often between near and far visual tasks, such as drivers checking navigation apps or professionals alternating between screen work and face-to-face interaction, benefit from the convenience of bifocals. Whether you are a teacher, office worker, or someone who values efficiency in daily activities, bifocals can reduce the frustration of constantly removing and replacing glasses. Occupational Use Bifocals serve well in occupations requiring integrated viewing distances, including teachers, office workers, technicians, and craftspeople. They allow for quick visual transitions without changing eyewear, improving efficiency and comfort throughout your workday. Instructions for new bifocal wearers 1. Initial Adjustment and Daily Wear Wear them consistently: Wear your new glasses all day to help your brain adapt faster. Do not keep switching back to your old pair. Start at home: Practice wearing them at home, especially while doing simple tasks like watching TV, before driving with them. Give it time: It takes about 1-2 weeks to fully adjust. 2. How to Look Through the Lenses Understand the zones: The top portion is for distance, and the bottom is for reading. Look above or below, not through the line: Avoid looking directly through the dividing line. Move your eyes up and down to choose the correct zone. Turn your head, not just your eyes: When looking around, turn your head toward the object rather than looking through the sides of the lenses. Lower your eyes, not your head: When reading, look down through the bottom section without lowering your head too much. 3. Safety and Movement Be careful on stairs and curbs: When walking down stairs, keep your chin tucked down and look through the top part of the lens to see your feet clearly, otherwise, the ground may look blurry or distorted. Take it slow: Avoid running or walking quickly until you are comfortable with your new depth perception. 4. Adjusting Habits Use proper lighting: Good light reduces eye strain. Position reading materials lower: Hold books or phones slightly lower than you are used to so you are naturally looking through the bottom segment. Keep them clean: Smudges make adjustment harder. 5. When to Seek Help If you are still having trouble after 2–3 weeks, or if you experience intense, persistent headaches, visit your eye care professional to ensure the frames are properly fitted or if a prescription adjustment is needed EFFECTIVE POWER The effective power

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