Vision Normal vision occurs when light rays reflect off an object, enter the eye through the pupil and are focused on the retina at the back of the eye.
Vision is good for both near and far objects.
A steeply curved cornea or elongated eye causes light to be focused in front of the retina and distance vision to be blurred. A flattened cornea or shortened eyeball causes light rays to focus behind the eye. Astigmatism is caused by a misshapened cornea causing light rays to be focused at several points causing indistinct and distorted vision at all distances. Cataract is a clouding of the lens of the eye which creates fuzzy or blurred vision. Cataracts are a result of the aging process but can also affect younger individuals.