Grating Visual Acuity with Short Exposure Duration

Abstract

Previously we reported that the critical duration of Landolt ‘C’ visual acuity was significantly prolonged in eyes with central serous retinochoroidopathy and macular edema, but that the critical duration for the increment threshold was not prolonged in these diseased eyes. To clarify the mechanisms behind this phenomenon, we measured the critical duration of grating visual acuity using grating charts generated on a monitor. The mean critical duration of 3 trials for a normal subject was 73.0 msec and 140 msec under two different conditions. These values were rather close to that of the threshold testing. The mechanisms behind critical durations in Landolt ‘C’ visual acuity and grating acuity are suspected to be different. The time dependency of grating acuity is rather similar to that of the increment threshold.KeywordsVisual AcuitySpatial FrequencyMacular EdemaExposure DurationTemporal SummationThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.