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Corrective lenses let some people see or read better if they have problems seeing. This is used by person who have poor eyesight. Contact lenses also help people see better.
Sunglasses are a kind of eyeglasses that keep too much sunlight from getting in people's eyes.
Some eyeglasses block blue light from a computer, game, smart phone and TV.
Eyeglasses have many models. So it may be worn for fashion.
There are two types of eyeglass frames. One is thin frame and this looks lighter, more rounded. The other is thick frame and this looks younger, more casual and more angular.