Staring at the sun or prolonged exposure to very bright lights like lasers and bright industrial lights could lead to permanent retinal damage in just a few minutes! When the light-sensing cells in the retina are overstimulated by a bright light, they release large amounts of signaling molecules, causing damage to the back of the eye. The simplest way to protect against possible retinal light damage is to wear sunglasses and a hat. The sunglasses should have a dark tint. If you hold the glasses up to a light, the light coming through the lenses should appear grey, brown, or yellowish brown—not blue, which is probably the most damaging light wavelength.
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