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Biofeedback of accommodation to reduce functional myopia: a case report.

A 30-yr-old man received biofeedback training of his accommodation to reduce his functional myopia. There were seven training sessions for a total time of 34 min. Each training session consisted of a baseline-level recording period followed by a feedback period, a second baseline-level recording period, and then a second feedback period. Reduction of the functional myopia was learned within a few minutes. Since the training was conducted in a dark environment, myopia reduction was not expected in an illuminated environment. Nonetheless, some generalization was demonstrated with a reduction in the subjective measures of myopia (about 1 D for the right eye, 0.50 D for the left eye) and improvement in unaided visual acuity (from about 20/50 to 20/30 for each eye).