Optical glasses use lenses, prisms, contact lenses, intraocular lenses, etc. to correct vision, eliminate visual fatigue, and protect or treat eyes. There are many types of glasses. There are optical glasses and contact glasses for correcting refractive errors. In addition to contact glasses, intraocular lenses can be implanted for correcting aphakia. In addition, there are various protective glasses, beauty glasses, and vision aids for correcting low vision. All lenses are thin lenses, whose degree is the reciprocal of the lens focal length (m). The concave lens will spread the light and reduce the image/convex lens will focus the light and enlarge the image.