Subcapsular cataract – occurs at the back of the lens and usually progress more quickly than other types. People with diabetes, extreme nearsightedness, retinitus pigmentosa or people who take steroid medications have a greater risk of developing a subcapsular cataract. Subcapsular cataracts cause blurriness and glare.

Nuclear cataract – A nuclear cataract clouds the lens in the center, forms deep in the central zone (nucleus) of the lens. Nuclear cataracts usually are associated with aging. They interfere with the ability to see distant objects. Interestingly, while the cataract is progressing, reading vision may temporarily improve because as the lens becomes more dense and cloudy, it changes the eye’s ability to focus, making it clearer up close than at far distances. This symptom is often referred to as “second sight.”

Cortical cataract – is characterized by white, wedge-like opacities that start in the periphery of the lens and work their way to the center in a spoke-like fashion. This type of cataract occurs in the lens cortex, which is the part of the lens that surrounds the central nucleus. The spokes block light, causing glare and loss of contrast. Both near and distance vision are slowly disrupted. Diabetics often develop this type of cataract.

http://www.allaboutvision.com/conditions/cataracts.htm

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