eyeball anatomy, internal organs body part nervous system, shortsighted, nearsighted, longsighted, farsighted, hyperopia myopia

anatomy care concave contact convex cornea corrected correction design diagnosis eyeball eyeglasses eyes eyesight farsighted farsightedness flat focal focus glass graphic health human hyperopia illustration internal iris lens long longsighted medical myopia nearsighted nerve nervous ophthalmology optic organs pupil refractive retina sclera short shortsighted sight sighted structure system treatment vector view vision