A 5-month-old Indian infant is brought to the pediatric clinic by the mother who notices the baby's right eye turning inward. On examination, the **corneal light reflex (marked C in the diagram) is asymmetric** — the reflex in the right eye appears displaced medially compared to the left eye. The mother also notes the baby has a broad nasal bridge and prominent epicanthal folds. Which of the following is the most appropriate NEXT step in management?

Explanation

## Why "Refer immediately to a pediatric ophthalmologist for evaluation and cover-uncover test" is right The **asymmetric corneal light reflex (Hirschberg test finding marked C)** is the hallmark screening sign for true strabismus. Although the infant has facial features common in Indian babies (broad nasal bridge, epicanthal folds) that can mimic strabismus, the **asymmetric reflex position indicates true ocular misalignment**, not pseudostrabismus. Pseudostrabismus would show **symmetric light reflexes** despite apparent inward turning. At 5 months of age, any persistent strabismus requires urgent referral to a pediatric ophthalmologist for definitive testing (cover-uncover test) and management, because untreated strabismus beyond 4–6 months risks **amblyopia** (lazy eye) and permanent visual impairment if not corrected before the critical period (age 7–9 years). The asymmetric reflex is the key finding that distinguishes true strabismus from pseudostrabismus and mandates specialist evaluation. ## Why each distractor is wrong - **"Reassure the mother that this is pseudostrabismus..."**: While broad nasal bridge and epicanthal folds are common in Indian infants and can cause pseudostrabismus, the **asymmetric corneal light reflex rules out pseudostrabismus**. In pseudostrabismus, light reflexes are symmetric. This response misinterprets the Hirschberg finding and delays necessary specialist care. - **"Prescribe hyperopic glasses without further evaluation"**: Although refractive accommodative esotropia (the most common type in children) is caused by uncorrected hyperopia and corrects with glasses, glasses cannot be prescribed without a comprehensive eye examination and refraction by an ophthalmologist. Prescribing empirically risks missing other causes (congenital esotropia, neurological pathology) and delaying amblyopia prevention. - **"Perform fundoscopy to rule out retinoblastoma..."**: While leukocoria (white pupil reflex) with strabismus is a red flag for retinoblastoma, this infant has no mention of leukocoria, proptosis, or pain. Fundoscopy is part of the comprehensive pediatric eye examination but is not the immediate next step; urgent referral to a specialist who can perform full evaluation (including fundoscopy) is appropriate. **High-Yield:** Asymmetric corneal light reflex = true strabismus (requires urgent referral); symmetric reflex = pseudostrabismus (reassurance). Each 1 mm reflex decentration ≈ 7° deviation. [cite: AK Khurana Ophthalmology 7e; Nelson 21e]