Cataract is opacity of the lens or capsule of the eye causing partial or total blindness. A cataract is a normal part of the aging process, and most older people have some degree of cataract. As individuals age, the lens of the eye that was clear may become cloudy. In advanced cases of cataract, the surgical removal of the cloudy lens is required. Other causes Diabetic retinopathy.
Diabetic retinopathy is an eye condition caused by diabetes.
Over a long period of time, diabetes can cause damage to the blood vessels at the back of the eye. This may result in a deterioration of vision. Trachoma is a contagious viral disease of the conjunctiva of the eye characterized by inflammation, hypertrophy, and granules of adenoid tissue. The damage leads to opacity or cloudiness of the cornea. Rubella is a contagious, eruptive disease caused by a virus and capable of causing congenital defects, such as blindness, in infants born to mothers who are infected during the first 3 months of pregnancy.