If you don't have your glasses with you and you need to read a distant sign or a close-up tiny product label, or see what kind of bird that is, you can actually pinch your fingers to do something about that. Make a little hole to look through by pinching your fingers close together. (Index finger and thumb of both hands pinched together to make a diamond-shaped pinhole works best). Hold it right up by your eye and look through it. It's like closing down the iris on a camera-- less light but better focus.
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