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Most people know that the sun's ultraviolet rays damage the skin, but that excessive exposure to harmful to the eyes in the purple line not many people, the United States optometry magazine also said that each part of the sun on the eye will have a destructive effect and there is cumulative, when the light is injected into the human eye, the only certain wavelengths of light to stimulate the retina's photoreceptor cells, so that we can see that this is the "visible", the optical field at a wavelength of 400mm to 800mm between, but the invisible ultraviolet light damage absorbed by the eye, long-term cumulative eye cornea, retina, lens, etc., will have damaging effects, will lead to cataracts, eye corneas and other eye diseases photochemical. Lens of the eye is very easy to absorb ultraviolet rays, ultraviolet radiation damage to the lens will be accumulated, and is irreversible, that is, with the skin, is irreparable.
Most importantly, UV is not visible, it is difficult to intuitively feel. UV damage is invisible to the eye, not immediately be able to feel it, if do not wear sunglasses usually do not feel particularly uncomfortable, but that your eyes on the visible light (such as the glaring light, glare, reflected light) is not very sensitive to does not prevent UV damage. Easily lead to a long time by its invasion of the eye cornea and retina damage, until the cause of cataract lens opacity, lead to permanent vision damage.
Sunglasses while playing a great role in safety equipment. By reducing glare, sunglasses so you can more clearly see the surrounding environment. You may have noticed that most of the Highway Patrol have to wear sunglasses, sunglasses can help them to focus attention on the object, such as 121 kilometers per hour, a car, without squinting.