Q All of the following are used to assess visual acuity in preverbal children, except:

INI-CET EXAM -2025

Child Health Nursing (Pediatrics)

Medium

Appeared in: INI-CET EXAM -2025

Explanation

The ETDRS (Early Treatment Diabetic Retinopathy Study) chart is the correct answer because it is a letter-based test.
This type of test requires the subject to be literate, meaning they must be able to recognize and name the letters of the alphabet.
Preverbal children, by definition, cannot speak, let alone read letters, making this test entirely unsuitable for them.

Option A: This is incorrect because the Optokinetic Nystagmus (OKN) drum is a standard tool for assessing vision in infants. It relies on an involuntary reflex and does not require any cooperation from the child.
Option B: This is incorrect because Teller acuity cards are specifically designed for infants and preverbal children. The test uses the principle of preferential looking, where the examiner observes the child's natural tendency to look at a pattern.
Option D: This is incorrect because the Landolt C chart is used for pre-literate children. While not suitable for preverbal infants, it is a valid test for young children who can understand instructions and point to indicate the direction of the gap, even if they cannot read letters.

Visual 1: Image - An Optokinetic Nystagmus (OKN) drum, showing the vertical black and white stripes.
Visual 2: Image - A set of Teller acuity cards, with one card showing fine gratings next to a gray area.
Visual 3: Image - An ETDRS chart, displaying rows of standardized letters in decreasing size.
Visual 4: Image - A Landolt C chart, showing the 'C' optotype oriented in different directions.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Methods of visual acuity assessment in preverbal children as background academic context rather than a clinical decision trigger.
Early detection of visual deficits is critical for preventing permanent vision loss, such as amblyopia ('lazy eye').
Nurses play a key role in performing vision screenings during well-child visits and identifying children who need referral to an ophthalmologist.
What if? If a 6-month-old infant consistently fails to track an object with one eye during a fixation test, the nurse should suspect strabismus or a significant refractive error and refer for a specialist evaluation immediately.

How to Approach the Question

First, identify the key terms in the question: 'preverbal children' (infants who cannot yet speak) and 'except' (look for the option that does not fit).
Analyze each option based on the skills required to perform the test.
Option A (OKN Drum) and Option B (Teller Cards) rely on reflexes or innate behaviors, not cooperation. These are suitable for preverbal children.
Option D (Landolt C) requires understanding and pointing. This is for a pre-literate child, not a preverbal one.
Option C (ETDRS Chart) requires reading letters. This is for a literate child or adult.
Compare the unsuitable options. The ETDRS chart requires the most advanced cognitive skill (literacy), making it the most definitive exception for a preverbal child.

Concept Tested & Keywords

Concept Tested: Methods of visual acuity assessment in preverbal children.
Stem keywords: visual acuity, preverbal children, assess
Lead-in keywords: except
Negative lead-in flag: The question asks for the exception, meaning three of the options are used for assessing visual acuity in young children, and one is not.

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