Cataracts form when proteins build up on the lens of the eye, turning it cloudy, like a fogged window.
This clouding blocks light from reaching the retina, causing blurred vision and, if untreated, blindness.
Though age is a major factor, cataracts can appear at any age, even in babies and young children (called congenital cataracts). If a child’s vision is blocked during their early years, their eyes and brain may not learn how to see clearly, even after surgery.