eyeball anatomy, internal organs body part nervous system, astigmatism corrected, eyesight concept

anatomy astigmatism blurred care concave contact convex cornea corrected correction design diagnose diagnosis diagram disease eye eyeball eyeglasses eyes eyesight flat focal focus glasses graphic health human illustration internal iris lens medical multiple nerve nervous ophthalmology optic organs pupil refractive retina sclera side sight sighted structure surgery system treatment vector view vision