In a child with unilateral congenital cataract that was left untreated beyond 6 months of age, which type of nystagmus is classically associated?

• A Sensory nystagmus (sensory deprivation nystagmus) ✓
• B Latent nystagmus
• C Spasmus nutans
• D Opsoclonus

Explanation

Dense unilateral or bilateral visual deprivation in infancy (congenital cataract, corneal opacity) before visual maturation results in sensory deprivation nystagmus, characterized by a bilateral, usually horizontal, pendular or jerky pattern that worsens with fixation attempts. It typically develops by 2-3 months of age with prolonged deprivation. Latent nystagmus is associated with strabismus/esotropia, not deprivation. Spasmus nutans presents later (6 months to 3 years) with head nodding.

Reference: Pediatric Ophthalmology and Strabismus, AAO BCSC, 2023-2024 ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.