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Positive occipital sharp transients of sleep in the blind

Department of Neurology, University of New Mexico School of Medicine, Albuquerque, New Mexico, and the Veterans Administration Hospital, Albuquerque, New Mexico.

Positive occipital sharp transients of sleep (POSTS) were evaluated in 23 legally blind subjects. Only those subjects with severe visual field defects but normal or near normal visual acuity showed this activity. Nineteen subjects with visual acuity of 20/200 or worse failed to exhibit these potentials, while a control group matched for age showed POSTS in 79 percent of cases. The production of POSTS appears to depend on the integrity of macular function and normal central visual acuity.

Dr. Zauel's address is Department of Ophthalmology, Indiana University College of Medicine, 1100 West Michigan Street, Indianapolis IN 46202.

Reprint requests should be addressed to Dr. Brenner, EEG Laboratory, Veterans Administration Hospital, 2100 Ridgecrest S.E., Albuquerque, NM 87108.

Accepted for publication June 6, 1977.