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Instead of wearing sunglasses, wear opaque contact lenses with just a tiny pinhole in the centre. You'd get images just as dim as with sunglasses, but with the advantage of near-infinite depth of field (translation: everything, from a few inches away to infinity would be in perfect focus) and colours
would be unaffected.
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Nice idea. Trouble is, if you got on a bus or the sun went in, they'd be a lot more difficult to take off than sunglasses. You would also really need to take them off, because your pupils dilating wouldn't have any effect - you'd effectively be blinded. They would only work when light levels were constant. |
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Except they would cause people to go blind. Sunglasses are good for your eyes because they reduce the quantity of light, and because they either contain, or are made from materials that block UV-A and UV-B light. The UV component of sunlight is what is actually causing the damage. Pinhole contacts, by their nature, can't protect from UV light. They would make your pupils expand, letting in even more damaging uv rays than if you were weren't wearing sun protection at all and the pupils contracted naturally to reduce the amount of light entering the eye. |
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