What Are Cataracts?
Cataracts are blockages in the path of light passing through the human lens. The human lens is a clear and colorless structure, which focuses light on the back of the eye. This structure can change with age, become opaque, whitish or have anterior or posterior surface changes. The most common cause for cataracts is aging and ultraviolet light exposure.
A study comparing watermen on the Chesapeake Bay people who worked in the canneries found that the individuals who worked outside on the water developed cataracts more frequently than those who worked in the canneries. The only variable between the two groups was the length of time exposed to light. In just a short period, it became obvious that protection from ultraviolet light, which is most intense at the surface of the water, would be helpful in limiting the incidence of cataracts. That is why the guidelines for the use of sunglasses have changed so dramatically over the years.
Cataracts can develop f