Many medical agents are under investigation, but none have been proven absolutely effective. There is evidence however that anti-oxidants, specifically vitamins A, C, and E may delay the development of cataracts. Cataracts can cause many different visual effects. Some types of cataracts can reduce close vision more than far vision and visa versa. Some cataracts will reduce distance and near vision.
Cataracts often increase glare that creates halos around headlights or street lights.
Glare can also significantly decrease vision on very bright days. Cataracts can also change the power of the human lens and thus the lens power needed for glasses. Some people find that as cataracts develop their need for glasses or their spectacle prescription also changes. Occasionally, the loss of optical quality due to cataract can also lead to double vision in one eye. A comprehensive dilated eye examination by an optometric physician will determine if you have cataracts.