Infantile nystagmus is a lifelong condition causing involuntary, rhythmic side-to-side or circular movements of both eyes that usually begins within the first few months of life.
Key Signs and Symptoms
Involuntary Eye Motion: Eyes continuously drift and snap back, most often horizontally.
Head Tilting: Children often hold their head in a specific tilted or turned angle. This position helps steady the eyes in what doctors call a “null zone”.
Reduced Vision: Blurry vision, light sensitivity, and poor depth perception are common.
Absence During Sleep: The rapid eye movements stop completely when the child is sleeping.
Underlying Causes
Idiopathic (Motor): Often inherited or linked to genetic mutations (such as the FRMD7 gene) without other major eye diseases.
Sensory Deficits: Frequently triggered by underlying visual pathway or eye problems present early in life, including:
Albinism (lack of pigment)
Bilateral congenital cataracts
Optic nerve hypoplasia (underdeveloped optic nerves)
Retinal dystrophies (like Leber congenital amaurosis)
Diagnosis and Management
Evaluation: Requires a comprehensive eye exam by a pediatric ophthalmologist or optometrist, and sometimes a neurological workup to rule out serious central nervous system issues.
Corrective Lenses: Glasses or contact lenses help optimize overall visual acuity. Contact lenses can sometimes provide better stability for the eye movements.
Prisms and Medications: Special prism glasses or specific oral medications (such as gabapentin or memantine) are occasionally used to reduce the intensity of the oscillation.
Surgical Options: Extraocular muscle surgery can help shift the eyes’ null zone, reducing awkward head postures and improving functional vision.