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Making VDT Use Easier on Your Eyes Video display terminals (VDTs) are a fact of life in today's workplace, but that doesn't mean headaches, tired eyes, blurred vision and eye strain have to be the tradeoff. In fact, "computer vision syndrome," caused by the stress that prolonged computer work puts on the eyes, can be prevented or eliminated in most cases.
To provide adequate protection for your eyes, sunglasses should: block out 99 to 100 percent of both UV-A and UV-B radiation screen out 75 to 90 percent of visible light be perfectly matched in color and free of distortion and imperfection have lenses that are gray for proper color recognition
Astigmatism is a vision condition that causes blurred vision due either to the irregular shape of the cornea, the clear front cover of the eye, or sometimes the curvature of the lens inside the eye. An irregular shaped cornea or lens prevents light from focusing properly on the retina, the light sensitive surface at the back of the eye. As a result, vision becomes blurred at any distance.