Cataracts is a common eye condition that affects the clarity of the lens of the eye but it does not affect the cornea. The lens is a clear structure behind the iris that helps focus light onto the retina, which sends visual signals to the brain. When a cataract develops, vision becomes clouding and opaque, which causes low vision or complete loss of vision. It also affects visual acuity (VA) which is a measure of the functionality of the eye to distinguish shapes and the details of objects at a given distance.