Sunglasses are not bad for your eyes and are meant to protect them from prolonged sun exposure. Sunglasses are not meant to be worn all the time. You should not wear your sunglasses in the shade, on a cloudy day, at night or indoors. Remember, your eyes and body need light from the sun for many other health reasons.
Polarized sunglasses have always been very popular among people who spend a lot of time outdoors and especially near water. The lenses of polarized sunglasses reduce glare reflected at some angles off shiny non-metallic surfaces, such as water, glass, snow or even asphalt. They allow wearers to see into water when only surface glare would otherwise be seen, and eliminate glare from a road surface...