Low Vision Rehabilitation Indian Medical PG Practice Questions and MCQs
Practice Indian Medical PG questions for Low Vision Rehabilitation. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Low Vision Rehabilitation Indian Medical PG Question 1: Which of the following statements are correct regarding primary survey/management of traumatic head injury patient?
I. Ensure adequate oxygenation and circulation
II. Exclude hypoglycaemia
III. Check for mechanism of injury
IV. Check pupil size and response
Select the answer using the code given below :
- A. II, III and IV
- B. I, III and IV
- C. I, II and III
- D. I, II and IV (Correct Answer)
Low Vision Rehabilitation Explanation: ***I, II and IV***
- **Primary survey** in trauma management, including head injury, focuses on immediately life-threatening conditions (Airway, Breathing, Circulation, Disability, Exposure). Ensuring adequate **oxygenation and circulation** (Statement I) is paramount to prevent secondary brain injury.
- Exclude **hypoglycemia** (Statement II) is critical because altered mental status due to low blood sugar can mimic head injury and delay appropriate treatment, making it an essential part of the 'D' (disability) assessment. Checking **pupil size and response** (Statement IV) is also part of the 'D' assessment, providing vital information about potential brain stem compromise or intracranial pressure changes.
*II, III and IV*
- While excluding hypoglycemia and checking pupil response are crucial parts of the primary survey, Statement III, "Check for mechanism of injury," is typically part of the **secondary survey** or initial assessment but not immediately life-saving like ABCD.
- The primary survey prioritizes immediate threats to life, and while understanding the mechanism of injury informs subsequent care, it does not directly address a patient's immediate physiologic stability.
*I, III and IV*
- This option includes checking the mechanism of injury (Statement III) as part of the primary survey, which is generally conducted after the **life-threatening conditions** are addressed.
- It omits the critical step of excluding **hypoglycemia** (Statement II), which is an immediate reversible cause of altered mental status that must be ruled out during the primary assessment.
*I, II and III*
- This option correctly includes ensuring adequate **oxygenation and circulation** (Statement I) and excluding **hypoglycemia** (Statement II) as part of the primary survey.
- However, it incorrectly includes checking for the **mechanism of injury** (Statement III) as a primary survey component and omits checking **pupil size and response** (Statement IV), which is an essential part of the 'Disability' assessment in the primary survey for head injury.
Low Vision Rehabilitation Indian Medical PG Question 2: Colour vision is with the help of:
- A. Cortex
- B. Optic disc
- C. Rods
- D. Cones (Correct Answer)
Low Vision Rehabilitation Explanation: ***Cones***
- **Cones** are photoreceptor cells in the retina responsible for **color vision** and high spatial acuity in bright light conditions.
- There are three types of cones, each sensitive to different wavelengths of light (red, green, and blue).
*Cortex*
- The **visual cortex** in the brain processes visual information, including color, but it relies on input from the photoreceptors.
- The cortex itself does not initially detect color; it interprets signals sent from the retina.
*Optic disc*
- The **optic disc** is the point where the optic nerve leaves the eye, and it contains no photoreceptor cells.
- This area is therefore known as the "blind spot" and cannot detect light or color.
*Rods*
- **Rods** are photoreceptor cells primarily responsible for **scotopic (low-light) vision** and peripheral vision.
- They are highly sensitive to light but do not detect color, only shades of gray.
Low Vision Rehabilitation Indian Medical PG Question 3: Which type of cataract is specifically associated with decreased reading ability?
- A. Blue dot cataract
- B. Nuclear cataract (Correct Answer)
- C. Fusiform cataract
- D. Punctate cataract
Low Vision Rehabilitation Explanation: ***Nuclear cataract***
- **Nuclear cataracts** cause progressive hardening and yellowing of the lens nucleus with increased refractive index
- This produces a **myopic shift** that initially causes **"second sight"** (temporary improvement in near vision)
- However, as the cataract progresses, the increasing opacity leads to **overall visual decline affecting both distance and near vision**, including reading ability
- Among the given options, nuclear cataract is the most common age-related cataract that significantly impairs vision including reading
*Blue dot cataract*
- **Blue dot cataracts** (cerulean cataracts) are small, bluish peripheral opacities, usually congenital and stationary
- They rarely cause significant visual impairment and do not affect reading ability
*Fusiform cataract*
- **Fusiform cataracts** are congenital spindle-shaped opacities along the visual axis
- While they can affect vision if dense, they are rare and not typically associated with progressive reading difficulty
*Punctate cataract*
- **Punctate cataracts** are small, scattered dot-like opacities in the lens
- They are often congenital or age-related and cause minimal visual disturbance
- Not specifically associated with decreased reading ability
Low Vision Rehabilitation Indian Medical PG Question 4: How much illumination is recommended by the Illuminating Engineering Society for general office work?
- A. 200 lux
- B. 100 lux
- C. 400 lux (Correct Answer)
- D. 900 lux
Low Vision Rehabilitation Explanation: ***400 lux***
- The **Illuminating Engineering Society (IES)** recommends 400 lux for general office work, which includes tasks requiring moderate visual precision.
- This level of illumination ensures **adequate visibility** and **reduces eye strain** for typical office activities.
*200 lux*
- This level is generally considered **too low** for detailed office work and would likely lead to eye fatigue and reduced productivity.
- 200 lux might be suitable for casual areas like **corridors** or **waiting rooms**, but not for active work environments.
*100 lux*
- **100 lux** is an extremely low level of illumination, typically suitable for areas with very minimal visual requirements, such as **storage rooms or archives**.
- It is **insufficient** for any form of general office work, making tasks difficult and uncomfortable.
*900 lux*
- While providing high illumination, **900 lux** is usually considered **excessive** for general office work and can lead to glare and discomfort.
- Such high levels are typically reserved for **precision tasks** like drafting or detailed examination, where very fine visual discrimination is needed.
Low Vision Rehabilitation Indian Medical PG Question 5: Macular sparing is associated with lesions in:
- A. Lesions in the optic nerve
- B. Lesions in the lateral geniculate body
- C. Lesions in the occipital cortex (Correct Answer)
- D. Lesions in the optic chiasma
Low Vision Rehabilitation Explanation: ***Lesions in the occipital cortex***
- **Macular sparing** occurs when the central visual field (macula) is preserved despite damage to the occipital cortex, often due to its dual blood supply from the **middle cerebral artery** and the **posterior cerebral artery**. [2]
- This phenomenon typically results from a **vascular lesion** in the occipital lobe, leading to a **homonymous hemianopia** with a distinct sparing of the foveal region. [2], [3]
*Lesions in the optic nerve*
- Lesions in the optic nerve cause **monocular vision loss** or central scotomas, rather than the homonymous visual field defects associated with macular sparing. [2]
- Damage here affects the visual pathway **before** the optic chiasm, impacting the entire visual input from one eye. [2]
*Lesions in the lateral geniculate body*
- Lesions in the **lateral geniculate body (LGB)** produce **contralateral homonymous hemianopia** or quadrantanopia, but typically **do not exhibit macular sparing** as consistently as cortical lesions.
- The LGB processes visual information from both eyes before relaying it to the visual cortex. [1]
*Lesions in the optic chiasma*
- Lesions in the **optic chiasma** classically cause **bitemporal hemianopia**, affecting the temporal visual fields of both eyes. [2]
- This type of visual field defect is distinct from the homonymous defects seen with macular sparing, as it results from damage to the **crossing nasal fibers**. [2]
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