Rehabilitation of the Visually Impaired — MCQs
A 50-year-old patient has difficulty reading close objects. Likely diagnosis?
Which is the commonest cause of ocular morbidity in the community -
What is the cause of glaucoma in retinoblastoma?
A patient prescribed crutches for residual paralysis in poliomyelitis is a type of -
According to the WHO, what is the minimum distance at which a person is considered blind if they cannot count fingers in daylight?
Minimum visual acuity below which a person is called Blind
NPCDCS covers all except:
What is the WHO definition of blindness?
Economic blindness is defined as:
Fine tremors are primarily associated with which of the following conditions?
Rehabilitation of the Visually Impaired Indian Medical PG Practice Questions and MCQs
Question 1: A 50-year-old patient has difficulty reading close objects. Likely diagnosis?
- A. Hypermetropia
- B. Astigmatism
- C. Myopia
- D. Presbyopia (Correct Answer)
Explanation: ***Presbyopia*** - This condition is characterized by the **loss of elasticity** in the lens of the eye, which occurs naturally with age, making it difficult to focus on **near objects**. - Its typical presentation, as seen in this 50-year-old patient, is **difficulty reading close objects** or performing other tasks requiring near vision. *Hypermetropia* - Often causes **farsightedness**, meaning distant objects are seen clearly, but near objects appear blurry due to the eye attempting to constantly accommodate. - While it can make near vision difficult, it is not primarily an age-related loss of accommodation and can affect individuals of various ages. *Astigmatism* - Results from an **irregular curvature of the cornea or lens**, causing blurred or distorted vision at all distances, rather than specifically difficulty with close objects. - This condition makes it difficult for the eye to focus light uniformly on the retina, leading to multiple focal points or streaks. *Myopia* - This is commonly known as **nearsightedness**, where distant objects appear blurry while near objects are seen clearly. - It occurs when the eyeball is too long or the cornea is too steeply curved, causing light to focus in front of the retina.
Question 2: 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 3: What is the cause of glaucoma in retinoblastoma?
- A. Neovascularisation (Correct Answer)
- B. Mass effect of the tumour
- C. Blockage of trabecular network
- D. Lysis of the lens
Explanation: ***Neovascularisation*** - Retinoblastoma leads to **neovascularization of the iris (NVI)** and **angle structures** due to tumor necrosis, ischemia, and release of **angiogenic factors (VEGF)**. - The **neovascular membrane** grows over and obstructs the **trabecular meshwork** and anterior chamber angle, causing **secondary neovascular glaucoma**. - This is the **most characteristic and common mechanism** of glaucoma in advanced retinoblastoma. - Neovascular glaucoma in retinoblastoma is typically **refractory to medical treatment** and indicates poor prognosis. *Blockage of trabecular network* - While tumor cells can directly seed into the anterior chamber and block the trabecular meshwork, this mechanism is **less common** than neovascularization. - This option is also **less specific** as it doesn't identify the underlying pathophysiological process (neovascularization) that is characteristic of retinoblastoma-associated glaucoma. - Direct trabecular blockage by tumor cells typically occurs in advanced disease and often coexists with neovascularization. *Mass effect of the tumour* - The tumor mass itself rarely causes glaucoma through direct mechanical compression of outflow pathways. - Retinoblastoma causes glaucoma primarily through **secondary mechanisms** such as inflammation, neovascularization, or cellular seeding, not simple bulk effect. - Massive tumors may cause angle closure, but this is uncommon compared to neovascular mechanisms. *Lysis of the lens* - **Phacolytic glaucoma** from lens protein leakage is rare in retinoblastoma. - While lens damage can occur with advanced tumors, it is **not a typical or characteristic cause** of glaucoma in retinoblastoma. - The primary mechanisms involve the **tumor-angle-trabecular meshwork axis**, not lens pathology.
Question 4: A patient prescribed crutches for residual paralysis in poliomyelitis is a type of -
- A. Disability limitation
- B. Primordial prevention
- C. Primary prevention
- D. Rehabilitation (Correct Answer)
Explanation: ***Rehabilitation*** - Rehabilitation is a component of **tertiary prevention** that aims to restore maximum functional ability after permanent damage has occurred from disease. - Providing crutches to a polio patient with **residual (established) paralysis** helps restore mobility and independence, allowing the patient to adapt to their permanent disability. - This intervention occurs **after the disease has run its course** and permanent sequelae have developed, which is the hallmark of rehabilitation. *Disability limitation* - Disability limitation is another component of **tertiary prevention** but focuses on **preventing progression or complications** of an already established disease. - It applies during the **disease active phase** to minimize further damage (e.g., physiotherapy during acute polio to prevent contractures, or strict glycemic control in diabetes to prevent complications). - In this case, the paralysis is **residual (fixed)**, not active, so we are beyond the disability limitation phase. *Primordial prevention* - Primordial prevention targets the underlying environmental and social determinants to prevent the emergence of risk factors at the population level. - This occurs **before any risk factors** for disease have developed (e.g., policies to prevent emergence of sedentary lifestyles). - Not applicable to a patient with established disease. *Primary prevention* - Primary prevention aims to prevent disease occurrence by reducing risk factors or increasing resistance (e.g., polio vaccination, health education). - This intervention is applied **before the disease occurs**, which is not the case for a patient with established paralysis from poliomyelitis.
Question 5: According to the WHO, what is the minimum distance at which a person is considered blind if they cannot count fingers in daylight?
- A. 1 metre
- B. 2 metres
- C. 3 metres (Correct Answer)
- D. 4 metres
Explanation: ***3 metres*** - The **WHO definition of blindness** includes the inability to count fingers at 3 meters (or 10 feet) in daylight. - This serves as a practical measure for severe **visual impairment** when standard acuity charts are unavailable. *1 metre* - While a significant visual impairment, the inability to count fingers at 1 meter is typically categorized as **severe visual impairment**, not outright blindness, by the WHO. - Severe visual impairment has a slightly less stringent threshold than the definition of blindness. *2 metres* - The inability to count fingers at 2 meters also falls under the category of **severe visual impairment**, according to WHO criteria. - It indicates significant vision loss but is not the specific distance used to define blindness when counting fingers. *4 metres* - A person unable to count fingers at 4 meters would certainly meet the criteria for **blindness**, as this is a greater distance than the 3-meter threshold. - However, the 3-meter mark is the **minimum specified distance** for this particular criterion of blindness by the WHO.
Question 6: Minimum visual acuity below which a person is called Blind
- A. 6/60
- B. 2/60
- C. 4/60
- D. 3/60 (Correct Answer)
Explanation: ***3/60*** - This is the **WHO and Indian definition threshold for legal blindness** - visual acuity of 3/60 or worse in the better eye with best possible correction - This means seeing at 3 meters what a person with normal vision sees at 60 meters - Visual acuity **below 3/60** (i.e., 3/60 or worse) qualifies as blind - This is the internationally recognized standard used in **NEET-PG and Indian ophthalmology practice** *6/60* - Visual acuity of 6/60 represents **severe visual impairment** but NOT blindness - This is above the 3/60 threshold, so does not meet criteria for legal blindness - Classified as "severely visually impaired" rather than blind *2/60* - While 2/60 is definitely blindness (being worse than 3/60), it is NOT the **minimum threshold** - The question asks for the cutoff point, which is 3/60 - This represents a more severe degree of blindness beyond the defining threshold *4/60* - Like 2/60, this is also below the 3/60 threshold and qualifies as blindness - However, it is NOT the standard defining threshold - The established cutoff remains **3/60** per WHO/Indian guidelines
Question 7: NPCDCS covers all except:
- A. Depression (Correct Answer)
- B. Diabetes
- C. Hypertension
- D. Stroke
Explanation: ***Depression*** - The **National Programme for Prevention and Control of Cancer, Diabetes, Cardiovascular Diseases and Stroke (NPCDCS)** specifically focuses on the prevention and control of non-communicable diseases such as **cancer, diabetes, cardiovascular diseases (including hypertension and myocardial infarction), and stroke**. - While depression is a significant non-communicable disease, it is not explicitly covered under the primary scope of the NPCDCS, which has a distinct focus on the four mentioned disease groups. *Diabetes* - **Diabetes** is one of the foundational non-communicable diseases directly addressed by the NPCDCS, with specific initiatives for its prevention, early detection, and management. - The program aims to reduce the burden of diabetes through various health promotion and healthcare delivery strategies. *Hypertension* - **Hypertension** is a major risk factor for cardiovascular diseases and stroke, and its control is a key component of the NPCDCS. - The program includes screening, diagnosis, and management protocols for hypertension as part of its strategy to reduce cardiovascular morbidity and mortality. *Stroke* - **Stroke** is explicitly part of the NPCDCS mandate, as indicated by its inclusion in the program's full name. - The program addresses stroke through prevention initiatives, early recognition campaigns, and strengthening healthcare services for acute and rehabilitation care.
Question 8: 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 9: Economic blindness is defined as:
- A. Vision 6/60 to 3/60 (Correct Answer)
- B. Social blindness with vision below 3/60.
- C. Complete blindness with no perception of light
- D. Severe visual impairment with vision below 1/60
Explanation: ***Vision 6/60 to 3/60*** - **Economic blindness** refers to a level of visual impairment where an individual is unable to perform most jobs requiring good sight. - This category specifically encompasses visual acuity ranging from **6/60 to 3/60** (or 20/200 to 20/400 in feet). *Severe visual impairment with vision below 1/60* - Vision below **1/60** with significant visual field loss is typically classified as **absolute blindness** or **total blindness**. - This degree of impairment is more severe than economic blindness and often implies a complete inability to see objects. *Social blindness with vision below 3/60* - **Social blindness** is defined by a visual acuity of **3/60 or less**. - This level indicates significant visual impairment where an individual may be unable to navigate independently in an unfamiliar environment. *Complete blindness with no perception of light* - This definition describes **total blindness** or **no light perception (NLP)**. - It represents the most severe form of visual loss, where the individual cannot perceive any light.
Question 10: Fine tremors are primarily associated with which of the following conditions?
- A. Parkinson's disease
- B. Multiple sclerosis
- C. Essential tremor (Correct Answer)
- D. None of the options
Explanation: Essential tremor - Essential tremor is characterized by **fine, rhythmic tremors** that often affect the hands and can worsen with activity or stress. - It's typically an **action tremor**, meaning it occurs during voluntary movement, contrasting with resting tremors seen in other conditions. *Parkinson's disease* - Parkinson's disease primarily presents with a **resting tremor**, which is most noticeable when the affected limb is at rest [1]. - The tremor in Parkinson's is often described as a **"pill-rolling"** tremor, distinct from the fine action tremor of essential tremor [1]. *Multiple sclerosis* - Tremors in multiple sclerosis are typically **intention tremors**, meaning they appear or worsen during goal-directed movements, such as reaching for an object [2]. - These tremors are often **coarser and more irregular** than the fine tremors associated with essential tremor [2]. *None of the options* - This option is incorrect because essential tremor is a specific condition well-known for its characteristic fine tremor.
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