Congenital bilateral cataracts (clouded lenses present at birth in both eyes) and nystagmus (involuntary eye movements) often occur together with the cataracts depriving the developing visual system of clear images leading to poor vision and the development of sensory nystagmus to try and stabilize vision. This combination significantly impacts visual development causing permanent impairment if not treated early though prompt surgery and vision therapy can lead to better outcomes even with nysta