man with eye glasses trying to read book has sight problems

amblyopia ametropia astigmatism bad blurred book boy cataracts correction degeneration diabetic diopter disability disease distance edema education eyeglasses far fuzzy glare glasses glaucoma guy ill impaired learn lens macular male man medical myopia myopic near nearsighted ophthalmologist optician optometry patient people perception presbyopia presbyopic prescription problem read sighted squint tunnel view vision visually