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?
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?
A 65-year-old male is brought to the outpatient clinic with one year illness characterized by marked forgetfulness, visual hallucinations, suspiciousness, personality decline, poor self care and progressive deterioration in his condition. His Mini Mental Status Examination (MMSE) score 21. His most likely diagnosis is:
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: 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 5: 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 6: 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 7: 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 8: 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 9: 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.
Question 10: A 65-year-old male is brought to the outpatient clinic with one year illness characterized by marked forgetfulness, visual hallucinations, suspiciousness, personality decline, poor self care and progressive deterioration in his condition. His Mini Mental Status Examination (MMSE) score 21. His most likely diagnosis is:
- A. Schizophrenia
- B. Dementia (Correct Answer)
- C. Depression
- D. Mania
Explanation: ***Dementia*** - The patient presents with **progressive cognitive decline** (forgetfulness, personality decline, poor self-care), **visual hallucinations**, and a **low MMSE score (21)**, all highly indicative of dementia. - The **visual hallucinations** in the context of progressive cognitive decline are particularly suggestive of **Dementia with Lewy Bodies (DLB)**, where visual hallucinations are a core diagnostic feature. - The **insidious onset** and **progressive deterioration** over one year with prominent behavioral and cognitive symptoms rule out acute or remitting conditions and fit the profile of a neurodegenerative dementia. - **MMSE score of 21** indicates mild-to-moderate cognitive impairment, consistent with dementia. *Schizophrenia* - While schizophrenia involves hallucinations and personality changes, the primary feature is usually **psychosis with delusions and auditory hallucinations**, not visual hallucinations. - Schizophrenia typically has an **earlier onset** (young adulthood) and does not present with **progressive memory decline and cognitive deterioration** as the dominant feature. - The **age of onset (65 years)** and **prominent cognitive decline** make late-onset schizophrenia very unlikely. *Depression* - Depression can cause cognitive symptoms (**pseudodementia**), but these are usually **reversible** and associated with prominent **mood disturbances** (sadness, anhedonia, hopelessness). - In pseudodementia, patients often **complain** about memory problems, whereas in true dementia, patients may be **unaware** or minimize deficits. - The presence of **visual hallucinations** and **sustained personality decline over one year** without mention of mood symptoms makes primary depression unlikely. *Mania* - Mania is characterized by **elevated or irritable mood**, **increased energy**, **racing thoughts**, **decreased need for sleep**, and **impulsive behavior**, none of which are described in this patient. - Cognitive disturbances in mania are **episodic** and associated with mood elevation, not characterized by **progressive, year-long decline** in memory and self-care.
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