What are the main causes and risk factors of cataract?

Aging: Most cataracts develop slowly as a result of aging. They may occur more rapidly in people with a history of an eye injury, uveitis or diabetes. Some are associated with genetic diseases. Cataracts can also occur as a side effect of radiation therapy or steroid drugs.

Age: Age, as you get older cataracts develop. Other causes can be trauma, steroid usage, prior eye surgery, genetics. Risk factors are UV sun exposure, steroids, smoking.