Report of Project MICHIGAN VISUAL ACUITY FOR CIRCULAR AREA LINE-GRATINGS PRESENTED AT VARIOUS INCLINATIONS IN THE VISUAL FIELD

摘要

Visual acuity was measured in the frontal plane of the visual field, utilizing a.-grating consisting of black and white bars at four inclinations. Measurements were made both with a sharp-edged circular aperture limiting the grating visible to the observers, and with a photographic transparency which produced a graduated rather than a sharp edge for the target pattern.nIt was found that significantly more errors were made in recognition of the orientation of the grating with the Graduated-Edge than with the Sharp-Edge mask. Errors were found to be least for the vertical and horizontal inclinations, and greatest for the two diagonal inclinations. These results were the same with each mask, so that no evidence was found that “edge-cues” influence the pattern of errors made at various inclinations.