What is cataract? Behind the iris and pupil there lies a natural lens. If this lens got clouded and blurred than we would call it cataract. Cataract surmount what glaucoma, macular degeneration, and diabetic retinopathy even collectively do for vision loss in people over age 40. It is also the principal case of blindness in the word.
Types of cataracts include:
- A subcapsular cataract occurs at the back of the lens. People with diabetes or those taking high doses of steroid medications have a greater risk of developing a subcapsular cataract.
- A nuclear cataract forms deep in the central zone (nucleus) of the lens. Nuclear cataracts usually are associated with aging.
- A 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.