Examination and reevaluation of prosthetic lenses employing an operant procedure for measuring subjective visual acuity in a retarded child.
D002648:Child; D005139:Eyeglasses; D005260:Female; D006801:Humans; D008607:Intellectual Disability; D009633:Nonverbal Communication; D011581:Psychological Tests; D012055:Reinforcement Schedule; D014792:Visual Acuity