Prevent blindness.
D000328:Adult; D000368:Aged; D000375:Aging; D001766:Blindness / Q000209:etiology / Q000517:prevention & control*; D002386:Cataract / Q000150:complications; D005901:Glaucoma / Q000150:complications / Q000175:diagnosis; D006801:Humans; D011305:Presbyopia / Q000209:etiology; D014065:Tonometry, Ocular