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There are mainly three types of cataract.
A nuclear cataract occurs in the center of the lens. This type is the most common form of cataract and is associated with the natural aging process.
The cortical cataract begins with spoke-like formation extending from the outside of the lens into the center. When the spokes reach the center, blurring and glare result in loss of vision. Diabetics commonly develop this type of cataract.
A subcapsular cataract develops very slowly and starts at the back of the lens. Symptoms may not appear until the opacity is well developed. Subcapsular cataracts are often found in patients with diabetes, high myopia, retinitis pigmentosa, and people taking steroids for extended periods.