Pediatric Low Vision Rehabilitation — MCQs
Scleral Expansion Bands are used in the management of:
What does a visual acuity test primarily assess?
A 50-year-old patient has difficulty reading close objects. Likely diagnosis?
Which is the commonest cause of ocular morbidity in the community -
Under NPCB, screening of school children is first done by -
In infants of diabetic mothers (IDM), when is ophthalmologic evaluation indicated?
Which of the following statements about congenital glaucoma is incorrect?
A patient with visual acuity of less than 6/60 but more than 3/60 in the better eye is considered to have:
Visual acuity of 6/60 is classified as?
Which of the following best defines blindness?
Pediatric Low Vision Rehabilitation Indian Medical PG Practice Questions and MCQs
Question 1: Scleral Expansion Bands are used in the management of:
- A. Astigmatism
- B. Keratoconus
- C. Presbyopia (Correct Answer)
- D. Myopia
Explanation: ***Presbyopia*** - **Scleral expansion bands** are a surgical treatment strategy designed to restore the eye's ability to accommodate by altering the biomechanics of the sclera and ciliary body. - They aim to improve the range of motion of the ciliary body, thereby allowing the **lens to change shape** more effectively for near vision in **presbyopic** patients. *Astigmatism* - **Astigmatism** is primarily caused by an **irregularly shaped cornea** or lens, leading to blurred vision at all distances. - It is typically managed with corrective lenses (glasses or contact lenses) or refractive surgeries like **LASIK** or **PRK**, which reshape the cornea. *Keratoconus* - **Keratoconus** is a progressive eye disease where the **cornea thins** and bulges into a cone-like shape, causing distorted vision. - Treatments include rigid gas permeable contact lenses, **corneal collagen cross-linking** to halt progression, and in severe cases, corneal transplant. *Myopia* - **Myopia**, or nearsightedness, occurs when the eye focuses images in front of the retina, often due to an **elongated eyeball** or excessive corneal curvature. - It is commonly corrected with concave lenses, contact lenses, or refractive surgeries such as **LASIK** or **PRK** to flatten the cornea.
Question 2: What does a visual acuity test primarily assess?
- A. Ability to perceive light
- B. Ability to differentiate colors
- C. Ability to recognize shapes and details (Correct Answer)
- D. Ability to detect contrast
Explanation: ***Ability to recognize shapes and details*** - A visual acuity test, typically using a **Snellen chart**, measures the sharpness of vision, specifically the ability to discern letters or symbols at a given distance. - It assesses the eye's capacity to resolve fine **spatial detail**, which is crucial for tasks like reading and recognizing faces. - This is the fundamental definition of visual acuity and what these tests are specifically designed to measure. *Ability to perceive light* - This refers to **light perception (LP)**, the most basic form of vision, indicating whether a person can detect the presence or absence of light. - While essential for vision, it is a much simpler function than what visual acuity tests measure and is assessed separately. *Ability to differentiate colors* - This is assessed by **color vision tests**, such as the Ishihara plates, which evaluate the function of cone photoreceptors. - It specifically checks for **color blindness** (e.g., red-green or blue-yellow deficiencies) and is distinct from the sharpness of vision. *Ability to detect contrast* - This is measured by **contrast sensitivity tests**, which evaluate the ability to distinguish objects from their background at various contrast levels. - While related to overall visual quality, it is a different aspect of vision than the ability to recognize fine details at high contrast.
Question 3: 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 4: 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 5: Under NPCB, screening of school children is first done by -
- A. Ophthalmologic assistant
- B. Medical officer
- C. Village health guide
- D. School teachers (Correct Answer)
Explanation: ***School teachers*** - Under the **National Programme for Control of Blindness (NPCB)**, screening of school children follows a **three-tier approach**. - **School teachers** are trained to conduct the **first level/initial screening** using simple vision tests like **Snellen charts**. - They identify children with potential vision problems and refer them for further detailed assessment. - This approach maximizes coverage as teachers have regular contact with children and can screen large numbers efficiently. - The NPCB specifically includes **teacher training modules** for basic vision screening as part of the School Eye Screening Programme. *Ophthalmologic assistant* - Ophthalmic assistants/paramedical workers conduct the **second level screening** - the detailed assessment of children referred by teachers. - They perform comprehensive vision testing and identify specific refractive errors and eye conditions. - They are not the first point of contact in school screening due to resource limitations and the scale of screening required. *Medical officer* - Medical officers and ophthalmologists are involved in the **third tier** - providing diagnosis, treatment, and management of identified cases. - They handle complex cases, prescribe spectacles, and provide surgical interventions when needed. - They also supervise the overall program but do not conduct initial mass screening. *Village health guide* - Village health guides work primarily in community settings for general health promotion and basic healthcare. - While they contribute to community health awareness, they are not specifically involved in the structured school eye screening program under NPCB.
Question 6: In infants of diabetic mothers (IDM), when is ophthalmologic evaluation indicated?
- A. At the time of diagnosis
- B. Only if visual symptoms develop (Correct Answer)
- C. After 5 years routinely
- D. After developing diabetes
Explanation: ***Only if visual symptoms develop*** - Unlike **retinopathy of prematurity**, infants of diabetic mothers (IDMs) do not have a higher incidence of **retinopathy** or other **ocular abnormalities** at birth or in early infancy. - **Ophthalmologic evaluation** is generally reserved for IDMs who develop specific **visual symptoms** or signs of ocular pathology. *At the time of diagnosis* - Routine ophthalmologic screening at the time of diagnosis of IDM is **not standard practice**, as the risk of **congenital ocular anomalies** is not substantially elevated to warrant universal screening. - Initial management focuses on metabolic stability, especially **glucose control**, and screening for other common IDM-related complications like **cardiac defects** or **respiratory distress**. *After 5 years routinely* - There is **no evidence or recommendation** for routine ophthalmologic screening of IDMs specifically at the age of 5 years. - Regular **well-child check-ups** include basic vision screening, which would identify significant refractive errors or strabismus, but not specifically for diabetes-related ocular issues. *After developing diabetes* - While it is true that individuals with **type 1 or type 2 diabetes** require regular **ophthalmologic evaluations** for **diabetic retinopathy**, this refers to the child developing diabetes later in life, not being an IDM. - Being an IDM is a **risk factor for developing diabetes** later in life, but it doesn't automatically mean they have diabetes-related ocular issues from birth.
Question 7: Which of the following statements about congenital glaucoma is incorrect?
- A. Thin and blue sclera seen
- B. Anterior chamber is shallow (Correct Answer)
- C. Photophobia is most common symptom
- D. Haab's Striae may be seen
Explanation: ***Anterior chamber is shallow*** - In congenital glaucoma, the **anterior chamber depth is typically normal or deep**, not shallow. - A shallow anterior chamber is more characteristic of **angle-closure glaucoma**, which is mechanistically different. - This makes the statement incorrect, as congenital glaucoma is associated with a **deep anterior chamber** due to globe enlargement. *Photophobia is most common symptom* - **Photophobia** (sensitivity to light) is indeed one of the classic presenting symptoms in congenital glaucoma. - It forms part of the classic triad: **photophobia, epiphora (tearing), and blepharospasm**. - This occurs due to **increased intraocular pressure** causing corneal edema and irritation. *Thin and blue sclera seen* - The **sclera** can appear thin and blue due to **buphthalmos** (enlargement of the eye) and stretching of the globe. - The stretching allows the underlying **uveal tissue** to show through, giving the characteristic blue appearance. - This is a direct consequence of elevated intraocular pressure in a developing eye. *Haab's Striae may be seen* - **Haab's striae** are **Descemet's membrane tears** that are pathognomonic of congenital glaucoma. - These horizontal or curvilinear breaks occur due to stretching of the cornea from **elevated intraocular pressure**. - They appear as visible linear opacities on corneal examination.
Question 8: A patient with visual acuity of less than 6/60 but more than 3/60 in the better eye is considered to have:
- A. Economical blindness (Correct Answer)
- B. Social blindness
- C. Legal blindness
- D. Absolute blindness
Explanation: ### Explanation **1. Why Economical Blindness is Correct:** In ophthalmology, **Economical Blindness** is defined as visual acuity of **less than 6/60 but better than or equal to 3/60** in the better eye with best possible correction. This threshold is significant because, at this level of vision, an individual is generally unable to perform any work for which eyesight is essential, leading to a loss of earning capacity. **2. Analysis of Incorrect Options:** * **Social Blindness:** This refers to visual acuity of **less than 3/60** in the better eye. At this stage, the individual cannot socially interact or move about independently in a strange environment. * **Legal Blindness:** This is a term used for administrative purposes (like disability benefits). According to the WHO and the National Programme for Control of Blindness (NPCB) India, it is defined as visual acuity **less than 3/60** or a visual field loss of **less than 10 degrees** in the better eye. * **Absolute Blindness:** This is the total absence of sight. Clinically, it is defined as **No Perception of Light (No PL)** in both eyes. **3. NEET-PG High-Yield Pearls:** * **WHO Definition of Blindness:** Visual acuity < 3/60 or visual field < 10° in the better eye. * **NPCB India Definition (Revised):** To align with WHO, India now defines blindness as visual acuity **< 3/60** (previously it was < 6/60). * **Low Vision:** Visual acuity between **< 6/18 and 3/60** in the better eye. * **One-Eyed Person:** If the vision in one eye is 6/6 and the other is No PL, the person is **not** considered blind by WHO/NPCB standards as the better eye is used for classification.
Question 9: Visual acuity of 6/60 is classified as?
- A. Low vision (Correct Answer)
- B. Normal vision
- C. Blindness
- D. Visual morbidity
Explanation: ### Explanation The classification of visual impairment is based on the **WHO (World Health Organization)** criteria, which are high-yield for NEET-PG. **1. Why Option A is Correct:** According to the WHO classification (ICD-10), **Low Vision** is defined as visual acuity of **less than 6/18 but equal to or better than 3/60** in the better eye with best possible correction. Since 6/60 falls within this range, it is categorized as low vision. Additionally, a visual field of less than 20 degrees around central fixation also qualifies as low vision, even if acuity is better. **2. Why the other options are incorrect:** * **Option B (Normal vision):** Normal visual acuity is defined as **6/6 or better**. Vision between 6/6 and 6/18 is considered "Mild or No Visual Impairment." * **Option C (Blindness):** Under WHO criteria, **Blindness** is defined as visual acuity **worse than 3/60** (less than 3/60 to no light perception) or a visual field of less than 10 degrees in the better eye. * **Option D (Visual morbidity):** This is a general term referring to any visual loss that interferes with daily activities; it is not a formal WHO classification category for specific acuity levels. **Clinical Pearls for NEET-PG:** * **NPCB (National Programme for Control of Blindness - India) Criteria:** Note that India previously used <6/60 as the cutoff for blindness to prioritize surgical backlogs, but it has now aligned with WHO criteria (**<3/60**) to match global standards. * **Categories of Impairment:** * Category 1 (Moderate): <6/18 to 6/60 * Category 2 (Severe): <6/60 to 3/60 * Category 3, 4, 5: Blindness (starting from <3/60) * **Visual Field:** Remember that a field of **<10°** is the threshold for blindness, regardless of Snellen acuity.
Question 10: Which of the following best defines blindness?
- A. Visual acuity less than 3/60 in the better eye after best possible correction (Correct Answer)
- B. Visual field less than 10 degrees from fixation in the better eye
- C. Inability to perceive light in both eyes
- D. Visual acuity less than 6/60 in the better eye
Explanation: ***Visual acuity less than 3/60 in the better eye after best possible correction*** - This defines **blindness** according to the **WHO/ICD-11 classification** (Category 3 and 4). - VA < 3/60 to 1/60 is **Category 3 blindness**, and VA < 1/60 to light perception is **Category 4 blindness**. - This is the internationally accepted standard definition of blindness. *Visual acuity less than 6/60 in the better eye* - In **India**, the National Programme for Control of Blindness and Visual Impairment (NPCB&VI) defines blindness as VA < 6/60 in the better eye with best correction. - However, the **WHO international standard** uses the more stringent criterion of < 3/60. - For global standardization and comparison, the **WHO definition (< 3/60)** is considered the primary reference. *Visual field less than 10 degrees from fixation in the better eye* - This is an **alternative criterion** for defining blindness according to WHO guidelines. - A person with VF < 10° (or < 20° in some definitions) is considered legally blind even if VA is better than 3/60. - Both VA and VF criteria are valid, but the question asks for the "best" single definition, where the **VA criterion** is most commonly cited. *Inability to perceive light in both eyes* - This represents **No Light Perception (NLP)** or **total blindness** (WHO Category 5). - This is the most severe form of blindness but is too restrictive as a general definition, as it excludes individuals with light perception or minimal vision who are still legally and functionally blind.
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