[Normal perceptual latencies during visual field measurement].

The perceptual latency (PL) to detect stimuli during visual field measurement is not a usual routine test. An automated perimeter ('moniteur ophtalmologique') was used to measure the central 30 degrees of vision with static targets in 50 normal subjects. The visual field was divided into four areas. The purpose of this study was to compare the PL in each area. An increase in the PL was observed, the nasal superior area being longer than the inferior temporal area. It seems that this psychophysical test is transmitted by a specific class of retinal ganglion cells: Y cells. We believe that PL could be a tool for detecting retinal ganglion cell damage.