Abstract
The purpose of this study was a recording of acoustic pupillen reflex by Iriscorder. Acoustic pupillen reflex of 10 normal hearing subjects was examined by Iriscorder. Based on this examination, the optimum intensity of illumination for acoustic pupillen reflex, appearance rate of pupillen reflex and its reflex pattern were discussed.
Prior to the experiment, three kinds of light intensity such as 0, 60, and 400 Lux were tested to determine the optimum intensity of illumination. The following results were obtained.
400 Lux light presumed the most available for our experiment because in 400 Lux light, pupillen were observed keeping physiologically composed condition, less varied in pupillen area in the stage of no stimili and when they were stimulated with sound, the pupillen area varied obviously.
On this method, acoustic pupillen reflex was induced in 8cases (80%) by 20dB tone stimuli, the other 2 subjects at over 40 dB. The reflex includes mydriasis pattern as it was reported previously.
The pupillen reflex pattern in our study was divided into 4 types, but these patterns were influenced by the condition of the subject and degree of sound pressure.
The peak latency of acoustic pupillen reflex was shortened according to the increasing sound pressure.
