Long-term exposure to the sun's UV (ultraviolet) radiation has been proven to treble the risk of cataracts, a progressive clouding of the eye's lens that can cause complete blindness. The easiest strategy to avoid cataracts is to shield your eyes from the sun's UV rays using specialized Cycling Sunglasses. Unprotected eyes exposed to UV radiation may also develop keratitis, which causes inflammation of the cornea and causes temporary blindness and a burning sensation. The heat of the sun is a secondary solar hazard that can dry out the eyes, make them tired, and possibly hasten the consequences of UV exposure. Sun exposure duration and intensity are both closely correlated with the risk of eye injury. The critical exposure level is unknown, although effects are cumulative and brief but regular periods of exposure to the elements can lead to problems.
