A cataract is a cloudiness or opacification of the normally clear lens of the eye. Depending on the size and location, the cataract can interfere with light passing to the retina and cause blurred vision. Cataracts are typically associated with older adults, but cataracts can occur at birth or during childhood. Early detection and treatment of cataracts are critical in infants and young children in order to restore normal visual development. A white area in the pupil and misalignment of the eye can be a sign of cataract. Pediatric cataracts that significantly obstruct vision require surgery. Patients subsequently require treatment with eyeglasses, bifocals, or contact lenses, and eye-patching. Often, pediatric cataracts result in some degree of lazy eye (amblyopia).