The lens is a lens lens embedded in the frame that is worn in front of the eye to improve vision, protect the eye or make up the decoration. There are also special glasses for viewing 3D stereoscopic images or virtual reality images.
Glasses can correct a variety of vision problems, including myopia, hyperopia, astigmatism, presbyopia or strabismus, but can not heal or cure these problems. Other types of glasses include goggles, sunglasses, swimming goggles, etc., providing various protections for the eyes.
Modern glasses usually have a nose pad (nose bridge) in the middle of the lens, and a cushion on the left and right arms resting on the ear, and there are also contact lenses.