Eyeglasses, also known as spectacles, are a type of corrective eyewear that are typically used to correct vision problems such as nearsightedness, farsightedness, and astigmatism. The lenses of eyeglasses are made of glass or plastic and are held in place by frames that rest on the bridge of the nose and ears. The term 'eyeglasses glass' refers to the lenses of eyeglasses, which are usually made of glass or plastic.