13 August 1976
Vol 193, Issue 4253

About The Cover

Waveform distortion patterns for six subjects with (top row) both 20/13 visual acuity, (middle row) 20/20 and 20/25, and (bottom row) 20/50 and 20/800 (conical cornea) visual acuity. Diagram of top right and that immediately below it are for same eye with and without contact lenses. See page 580. [Bradford Howland and Howard C. Howland, Cornell University, Ithaca, New York]