set of golovin sivtsev table eye test chart medical . line sketch outline white background

ophthalmologist orthoptist optometrist vision scientist chart optotype test eye eyesight sight check exam ophthalmology vector optician letter optometry visual examination alphabet glasses doctor optic medical optical focus myopia blind ophthalmic eyeglass text acuity graphic oculist print hospital ocular examining letters diagram illustration spectacles magnification retina shortsighted lens medicine impairment instrument