Optical experiences.
D001251:Astigmatism / Q000628:therapy; D003261:Contact Lenses; D003263:Contact Lenses, Hydrophilic; D003315:Cornea / Q000033:anatomy & histology; D005128:Eye Diseases / Q000628:therapy; D006801:Humans; D006956:Hyperopia / Q000628:therapy; D007640:Keratoconus / Q000628:therapy; D007908:Lens, Crystalline / Q000002:abnormalities; D011305:Presbyopia / Q000628:therapy; D014786:Vision Disorders / Q000628:therapy*; D014792:Visual Acuity