Early Evaluation of Infantile Nystagmus Pro and Con - ERG? Image?; Genetic Testing? Genetic Testing Before or After ERG? (Work-Up for Underlying Etiology Which May Include ERG and; Genetic Testing & Observe Without Further Work-up If Otherwise; Neurologically Normal)

Infantile nystagmus syndrome (previously termed congenital nystagmus, congenital motor nystagmus, or sensory nystagmus) is a new term coined by the Classification of Eye Movement Abnormalities and Strabismus (CEMAS) working group which encompasses nystagmus that presents during infancy from a heterogeneous group of etiologies.1 The condition may be idiopathic or may occur in the context of a retinal dystrophy/degeneration or neurodegenerative/systemic disease. Therefore, the clinician must carefully strive to determine underlying cause as this will guide further testing, facilitate appropriate counselling for visual prognosis, and impact broader management when associated with systemic or neurodegenerative disease.