Cataracts are any obstruction within the crystalline lens that prohibits light from passing through to form a sharp image on the retina in the back of the eye. There are several types of cataracts and they range in severity from only slight to complete blockage of light and vision.

There are actually many different causes of cataracts as well. If you get hit in the eye it can cause a Traumatic Cataract. Some medications can cause cataracts. Exposure to UV light can also cause cataracts. Congenital cataracts are present at birth, caused from a complication in development.