The ultraviolet (or UV) light given off by the sun is murder on your eyeballs. (Ever wonder why welders wear helmets? The intense heat of a welding torch generates the same eye-damaging UV light as the sun.) Even the sun’s reflection off water sand, or snow can sunburn our corneas (the clear surface of our eyes), making it feel like the inside of each eyelid is coated with sandpaper. Staring at the sun will damage our retinas, the cells at the rear of the eyes the sense light and color. Recovery from sun damage can take months. In some cases it caused permanent blindness.
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