two glasses prescriptions, concept of complex optical correction

astigmatism choice concept correction corrective doctor eye eyeglass eyeglasses eyesight eyewear farsightedness glasses health healthcare hyperopia icon lenses long medical medicine myopia nearsightedness oculist ophthalmic ophthalmologist ophthalmology optic optical optician optometrist optometry paper parameters patient presbyopia prescriber prescription reading sheet sight sightedness spectacles stamp understanding vector vision visual