Evaluation of the placebo effect in optometry.
D000223:Adaptation, Psychological; D002986:Clinical Trials as Topic; D005069:Evaluation Studies as Topic; D005139:Eyeglasses; D006801:Humans; D009907:Optometry; D010919:Placebos; D014786:Vision Disorders / Q000628:therapy*
D010919:Placebos