healthy and unhealthy human eyes side view cross section medial healthcare, iris

anatomical anatomy and anterior arteries balls biology body care cataract chamber chart choroid conditions cornea cross degeneration diagram drawing eye eyeball eyes eyesight graph health healthcare healthy human illustration infographic iris issues lens macula macular medial medical medicine nerve normal ophthalmology optic optical optometry organ pain pupil retina science section side sight sign symbol unhealthy uveitis vains vector view vision