Eyeglasses
Corrective lenses let some people see or read better if they have problems seeing. If the someone is long-sighted (the light is focusses past the retina), they use a different type of glasses than someone who is short-sighted. Lenses can also correct Astigmatism. Contact lenses also help people see better. Corrective lenses usually are made by opticians following eyeglass prescription from an optometrist. It's also possible to get adjustable focus glasses where one can change the lens power.