The relationship of the size of the surrounding field to visual acuity in the fovea.

Publisher Website
Google Scholar
Abstract
Monocular acuity in a 2[degree] foveal area, at retinal illuminations of 0.193, 10.1 and 318 photons, was measured in human subjects with an Ives grating. An annular illuminated field immediately surrounded the test object. It was varied in radial width from 2.5[degree] to 20[degree], and in brightness to produce retinal illuminations from 0.057 to 8560 photons. Increasing the size of the surrounding field served to decrease the acuity when it was brighter than the test object, had no consistent effect when the 2 were equal and improved acuity when the surrounding field was dimmer than the test object. These results are accounted for in terms of scattered light and a diffusional interaction on the physiological level in the retina.

This publication has 2 references indexed in Scilit: