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This is a critical concern, since reduction of the visible light will cause your pupil to dilate, letting in more of the UV light. Excess exposure to UV light will damage the cornea , lens, and retina of your eyes. A variety of manufacturers have touted blue-blocking lenses as the best thing on the sunglass market. Blue blockers remain controversial among vision experts. The eye's focusing mechanism and depth perception may depend upon the full color spectrum range to orient itself.