why do some doctors say that squinting will worsen your eye vision?
Squinting doesn't make your vision worse. Most people who squint are nearsighted, meaning that they can't see things far away as clearly as they would like. They may not be wearing glasses at all, may be wearing glasses that are too weak, or may have perfectly good glasses that they don't like to wear. If you are squinting frequently, go get yourself a pair of glasses with a correct prescription that you like to wear. You won't affect your vision by squinting, but you can give yourself premature wrinkles around your eyes if you do it frequently throughout the day for months or years.