refractive errors eyeball. hyperopia. medicine

anatomical anterior artery blurred central chamber choroid ciliary cornea correction defect diagnosis diopters disc errors eyeball eyesight farsightedness focal focus fovea health hyperopia intraocular iris lens light longsighted longsightedness medical medicine nerve ophthalmology optic optical optometrist optometry point pupil refraction refractive retina retinal sclera sight spot vein vision vitreous zonules