Types

The three main types of cataract are: nuclear, cortical or subcapsular. A nuclear cataract is most commonly seen as it forms. This cataract appears in the center of the lens and can bring about a temporary improvement in your near vision, called "second sight." Unfortunately, the improved vision is short-lived and will disappear as the cataract worsens.

A cortical cataract gradually extends from the outside of the lens to the center. Many diabetics develop cortical cataracts.

A subcapsular cataract begins at the back of the lens and may not produce any symptoms until the cataract is well developed. People with diabetes, high farsightedness (hyperopia) or retinitis pigmentosa may develop a subcapsular cataract, as well as people taking high doses of steroids.