This loss of transparency of the natural lens is called a cataract. A cataract decreases the amount of light that is focused on the retina, resulting in an overall blurriness of images. Having a cataract disturbs vision much like looking through a dirty windshield. Cataracts are not caused by over using the eyes. The computer has no effect on cataract development.
Cataracts progress more quickly with exposure to ultraviolet radiation and cigarette smoking.
Recent studies have shown that some vitamins, such as vitamin C may play a role in slowing down the development of cataracts. Other than the normal aging process cataracts can develop as a result of injury, systematic diseases, and certain drugs such as steriods . The retina is the thin, light sensitive, lining of the eye. The optic nerve sends the retinal image to the brain where vision occurs. Occassionally, the retina becomes torn and detaches from the internal portion of the eye causing reduced vision, floaters and sometimes flashes of light.