Visual Refractive Characteristics and the Subhuman Primate**This investigation was supported in part by U. S. Public Health Service research grant EY 00284 from the National Eye Institute; U. S. Public Health Service Institutional Grant to Washington State University; the 6571st Aeromedical Research Laboratory, Holloman Air Force Base, New Mexico; and U. S. Public Health Service research grant NB 05459 from the National Institute of Neurological Diseases and Blindness.