Which condition is commonly associated with congenital nystagmus?

• A. Diabetic retinopathy
• B. Thyroid disease
• C. Migraine
• D. Ocular albinism

Answer: (D)

Congenital nystagmus often signals an early disruption of visual input to the brain. When the sensory signal from the eye is poor or unstable from birth, the oculomotor system can’t maintain steady fixation, so rhythmic eye movements emerge to try to optimize the limited visual information available.

The most common association is ocular albinism. In this condition, reduced ocular pigmentation leads to developmental changes in the retina, including foveal hypoplasia, and abnormal routing of optic nerve fibers at the chiasm. These structural and functional changes degrade visual input from birth, so the brain relies on nystagmus as a compensatory mechanism. You’ll typically see nystagmus from infancy, often horizontal, and it may be accompanied by reduced visual acuity and characteristic retinal findings.

Other conditions listed aren’t typically linked to congenital nystagmus. Diabetic retinopathy and thyroid-related eye disease develop later and involve different pathophysiology, while migraine is a neurological disorder not usually associated with congenital eye movement issues.