Community Ophthalmology — MCQs

Community Ophthalmology Indian Medical PG Practice Questions and MCQs

Question 61: Under Vision 2020, to check visual acuity, a teacher will refer a school child to

A. Centre for excellence
B. Vision centre (Correct Answer)
C. Training centre
D. Service centre

Explanation: ***Vision centre*** - Under Vision 2020 initiatives, a **Vision Centre** serves as the primary point of contact for basic ophthalmic services, including **visual acuity screening** and referral. - These centers are designed to be accessible in local communities, allowing teachers and other local caregivers to refer school children for initial checks and appropriate management. *Centre for excellence* - A **Centre for Excellence** typically refers to a highly specialized institution with advanced diagnostic and treatment capabilities, research facilities, and complex surgical procedures, which is **beyond the scope** of basic visual acuity checking and initial referral. - Such centers handle more **complex or rare conditions** and are not the first point of contact for routine school-based screening. *Training centre* - A **Training Centre** is primarily dedicated to educating and skilling healthcare professionals, not to providing direct patient care or screening services to the general public. - While essential for developing skilled personnel, it is **not the appropriate facility** for a teacher to refer a child for a visual acuity check. *Service centre* - The term **Service Centre** is too broad and can refer to various types of facilities that provide any kind of service, but it does not specifically denote a healthcare facility for ophthalmic care under the Vision 2020 program. - It lacks the **specific medical context** and structured role established for vision screening.

Question 62: All of the following conditions are immediate priorities in the WHO's "Vision -2020: The Right to sight" except:

A. Cataract
B. Epidemic conjunctivitis (Correct Answer)
C. Onchocerciasis
D. Trachoma

Explanation: ***Epidemic conjunctivitis*** - While **epidemic conjunctivitis** can cause significant discomfort and temporary vision impairment, it is generally **self-limiting** and rarely leads to permanent blindness. - It was not identified as one of the top five global causes of avoidable blindness targeted by the Vision 2020 initiative. *Cataract* - **Cataract** is the **leading cause of blindness** globally, accounting for approximately half of all cases. - It is a highly treatable condition through surgery, making it a critical priority for Vision 2020. *Onchocerciasis* - Also known as **river blindness**, onchocerciasis is a parasitic disease that causes severe visual impairment and blindness. - It is a significant public health problem in several regions, particularly in Africa, and was a key focus of Vision 2020 due to its widespread impact and the availability of preventive chemotherapy. *Trachoma* - **Trachoma** is the **leading infectious cause of blindness** worldwide, caused by *Chlamydia trachomatis*. - Given its preventable and treatable nature, and its prevalence in many impoverished areas, it was designated as one of the priority diseases under Vision 2020.

Question 63: The golden period of eye donation is

A. 24 hours
B. 12 hours
C. 18 hours
D. 6 hours (Correct Answer)

Explanation: ***6 hours*** - The **golden period** for eye donation, specifically for the removal of the **cornea**, is ideally within **6 hours** of death. - This timeframe is critical to ensure the **viability and quality** of the corneal tissue for successful transplantation, as cellular degradation begins rapidly after cessation of circulation. *24 hours* - While some tissues can be recovered up to 24 hours post-mortem, the **cornea's viability** for transplantation significantly decreases after the initial 6-hour window. - Beyond 6 hours, the risk of **cellular damage** and reduced graft success rate increases considerably. *12 hours* - A 12-hour window is generally considered too long for optimal **corneal tissue viability**. - While tissue might still be recoverable, the **quality and success rate** of the transplant are significantly lower compared to donation within 6 hours. *18 hours* - An 18-hour period is far beyond the recommended timeframe for **corneal donation**. - At this point, the **cellular integrity** of the cornea is highly compromised, making it unsuitable for transplantation.

Question 64: Which is the commonest cause of ocular morbidity in the community -

A. Vitamin A deficiency
B. Ocular injury
C. Refractive error (Correct Answer)
D. Cataract

Explanation: ***Refractive error*** - **Uncorrected refractive errors**, such as **myopia**, **hyperopia**, and **astigmatism**, are the most common cause of avoidable visual impairment globally. - While not leading to complete blindness, they significantly reduce quality of life and productivity if not corrected with **spectacles** or **contact lenses**. *Vitamin A deficiency* - This deficiency is a major cause of **preventable childhood blindness** in developing countries. - It primarily leads to **xerophthalmia**, including **night blindness**, **Bitot's spots**, and ultimately **corneal scarring**. *Ocular injury* - **Trauma** to the eye can cause severe and permanent vision loss, especially in certain occupational settings or age groups. - However, the overall prevalence of significant ocular morbidity from injury in the general community is **lower** than that from uncorrected refractive errors. *Cataract* - **Cataracts** are the leading cause of **blindness worldwide**, particularly in older individuals. - While a major cause of visual impairment, it is most often treated with **surgery**, making uncorrected refractive errors a more prevalent cause of *morbidity* in the broader community that often goes undetected or unaddressed.

Question 65: Which of the following diseases is not included in "Vision 2020 - Right to Sight" immediate goals?

A. Trachoma
B. Epidemic conjunctivitis (Correct Answer)
C. Onchocerciasis
D. Cataract

Explanation: ***Epidemic conjunctivitis*** - While a common eye infection, **epidemic conjunctivitis** is typically **self-limiting** and rarely leads to permanent blindness, thus it was not a primary target for "Vision 2020" blindness prevention programs. - The "Vision 2020" initiative focused on conditions that were the leading causes of **avoidable blindness** globally, aiming to eliminate them as public health problems. *Trachoma* - **Trachoma** is a chronic infectious eye disease that can lead to irreversible blindness and was a major focus of the "Vision 2020" initiative. - It was targeted for elimination through strategies like improved hygiene, mass drug administration, and surgical interventions. *Onchocerciasis* - Also known as **river blindness**, onchocerciasis is caused by a parasitic worm and was a significant cause of blindness in endemic regions, making it a key component of the "Vision 2020" program. - The program aimed to control and eliminate the disease through mass drug administration of ivermectin. *Cataract* - **Cataract** is the leading cause of blindness worldwide and was a primary target for the "Vision 2020" initiative due to its high prevalence and the effectiveness of surgical treatment. - The initiative aimed to increase access to affordable cataract surgery to restore sight.

Question 66: SAFE strategy has been developed for the control of:

A. Trachoma (Correct Answer)
B. Refractive errors
C. Ocular trauma
D. Diabetic retinopathy

Explanation: ***Trachoma*** - The **SAFE strategy** is a comprehensive public health intervention specifically designed and recommended by the WHO for the global elimination of **trachoma**. - SAFE stands for **Surgery** for trichiasis, **Antibiotics** to treat Chlamydia trachomatis infection, **Facial cleanliness** to reduce transmission, and **Environmental improvement** to prevent reinfection. *Refractive errors* - Refractive errors are corrected with eyeglasses, contact lenses, or refractive surgery, not through the **SAFE strategy**. - While vision impairment is a concern in both, the underlying pathology and interventions are entirely different. *Ocular trauma* - Ocular trauma refers to injuries to the eye and requires immediate medical or surgical intervention, depending on the severity. - Its prevention and management do not involve the **SAFE strategy**, which targets infectious disease. *Diabetic retinopathy* - Diabetic retinopathy is a complication of diabetes affecting the eyes. Management involves controlling blood sugar, blood pressure, and cholesterol, and specific ophthalmological treatments like laser photocoagulation or anti-VEGF injections. - The **SAFE strategy** is unrelated to the pathogenesis or treatment of diabetic retinopathy.

Question 67: What is the WHO definition of blindness?

A. visual acuity less than 6/60 or its equivalent
B. visual acuity less than 3/60 or its equivalent (Correct Answer)
C. visual acuity less than 6/18 or its equivalent
D. visual acuity less than 1/60 or its equivalent

Explanation: ***Visual acuity less than 3/60 or its equivalent*** - The **WHO definition of blindness** refers to a **presenting visual acuity** of less than 3/60 (or 20/400) in the better eye, or a **visual field** of less than 10 degrees from the point of fixation. - This threshold signifies severe visual impairment that meets the criteria for legal or public health definitions of blindness. - The 3/60 criterion is the internationally recognized standard for defining blindness in epidemiological and public health contexts. *Visual acuity less than 6/60 or its equivalent* - This level of vision typically falls under the category of **severe visual impairment** or **low vision** according to WHO classification, not blindness. - While it represents significant visual loss, it is considered less severe than the 3/60 threshold used for defining blindness. *Visual acuity less than 6/18 or its equivalent* - A visual acuity of less than 6/18 is generally considered **moderate visual impairment** or **low vision**, not blindness. - This level of vision implies difficulty with standard visual tasks but is typically not severe enough to be classified as blindness. *Visual acuity less than 1/60 or its equivalent* - This visual acuity is indeed very poor and would certainly be classified as blindness, but it is **more severe** than the WHO definition threshold. - The 3/60 threshold is the specific cutoff point; while 1/60 indicates blindness, it is not the definition itself.

Question 68: Vision 2020 "The right to sight" includes all except-

A. Measles induced blindness (Correct Answer)
B. Onchocerciasis
C. Trachoma
D. Cataract

Explanation: ***Measles induced blindness*** - Vision 2020 primarily targets conditions that are either preventable or treatable with *cost-effective interventions* and contribute significantly to *avoidable blindness*. - While measles can cause blindness, the specific program focuses on a defined list of priority diseases for intervention, and measles-related blindness is generally addressed through broader public health initiatives (vaccination) rather than direct "right to sight" surgical or direct medical interventions for established blindness. *Onchocerciasis* - **Onchocerciasis** (river blindness) is a major focus of Vision 2020 due to its profound impact on sight, particularly in endemic areas. - It is a **preventable** and **treatable** cause of blindness through mass drug administration. *Trachoma* - **Trachoma** is recognized as one of the leading infectious causes of blindness globally and is explicitly targeted by Vision 2020 through the **SAFE strategy** (Surgery, Antibiotics, Facial cleanliness, Environmental improvement). - It is a highly **preventable** and **treatable** condition, fitting the program's objectives. *Cataract* - **Cataract** is the leading cause of blindness worldwide and is highly **treatable** through a relatively simple and cost-effective surgical procedure. - Providing cataract surgery is a cornerstone of the Vision 2020 initiative to restore sight.

Question 69: Which of the following is recognized as the apex national institute of ophthalmology in India?

A. Dr. R P Centre for Ophthalmic Sciences, AIIMS, New Delhi (Correct Answer)
B. Sankara Nethralaya, Chennai
C. Advanced Eye Care, PGIMER, Chandigarh
D. Regional Institute of Ophthalmology (RIO)

Explanation: ***Dr. R P Centre for Ophthalmic Sciences, AIIMS, New Delhi*** - Dr. R P Centre for Ophthalmic Sciences at AIIMS, New Delhi, is widely recognized as the **apex national institute for ophthalmology in India**, leading in patient care, research, and education. - Its status is attributed to its comprehensive facilities, advanced research, and significant contributions to **ophthalmic training and healthcare policy** at a national level. *Shankara Netralaya, Chennai* - Though a highly reputed and large-scale eye hospital, Sankara Nethralaya is a **private, not-for-profit institution** and does not hold the official "apex national institute" designation. - It is renowned for its clinical excellence and research but primarily operates as a **tertiary care center** rather than a national apex body. *Advanced Eye Care, PGIMER, Chandigarh* - The Advanced Eye Centre at PGIMER, Chandigarh, is a prominent **regional institute** and a center of excellence in ophthalmology in North India. - While it provides high-quality care and education, it is not designated as the **national apex body** for ophthalmology across India. *Regional Institute of Ophthalmology (RIO)* - There are several Regional Institutes of Ophthalmology (RIOs) located across different states in India, established to provide **specialized eye care** and training within their respective regions. - Each RIO serves as a **regional hub**, but no single RIO represents the overall national apex institution for ophthalmology in India.

Question 70: SAFE strategy is recommended for-

A. Diabetic retinopathy
B. Trachoma (Correct Answer)
C. Glaucoma
D. Cataract

Explanation: ***Trachoma*** * The **SAFE strategy (Surgery, Antibiotics, Facial Cleanliness, Environmental improvement)** is the WHO-recommended public health approach for the elimination of **trachoma**, a chronic eye infection caused by *Chlamydia trachomatis*. * This comprehensive strategy addresses both active infection and its blinding sequelae, specifically **trichiasis** (in-turned eyelashes) through surgery. *Diabetic retinopathy* * Management of diabetic retinopathy primarily involves **blood sugar control, regular ophthalmologic exams, laser photocoagulation, and anti-VEGF injections**, not the SAFE strategy. * The focus is on preventing and treating retinal damage caused by **diabetes**, which is distinct from infectious causes. *Glaucoma* * Glaucoma is characterized by **optic nerve damage** and visual field loss, usually due to elevated intraocular pressure, and is managed with **medication, laser therapy, or surgery (e.g., trabeculectomy)**. * It is a **neurodegenerative condition**, not an infectious disease, so the SAFE strategy is not applicable. *Cataract* * Cataracts involve the **clouding of the natural lens** of the eye, leading to blurred vision, and are primarily treated through **surgical removal of the cloudy lens** and implantation of an artificial intraocular lens. * This condition is age-related or can be caused by trauma or disease, but it is **not an infection** for which the SAFE strategy would be relevant.

Practice by Chapter

Epidemiology of Ocular Diseases

Practice Questions

Preventable Blindness

Practice Questions

Vision 2020 and Beyond

Practice Questions

School Eye Health Programs

Practice Questions

Screening Programs

Practice Questions

Eye Banking and Corneal Transplantation

Practice Questions

Primary Eye Care

Practice Questions

Rehabilitation of the Visually Impaired

Practice Questions

Eye Health Education

Practice Questions

National Programs for Eye Care

Practice Questions

Role of Non-Governmental Organizations

Practice Questions

Economics of Eye Care

Practice Questions

Telemedicine in Ophthalmology

Practice Questions

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