young child smiling happy at hospital looking through optometric hospital device checking eyes having sight exam in ophthalmology

background care check child clinic clinical correction corrective device diagnosis doctor equipment exam eye eyeglasses eyes eyesight gear glasses happy head health healthcare hospital instrument isolated kid lens machine medical medicine oculist ophthalmic ophthalmologic ophthalmologist ophthalmology optic optical optician optometric optometrist optometry patient phoropter retina sight specialist technology test vision visual young