[Time parameters of the retinal control of light intensity and influencing parameters]

The variability of the pupillomotoric control of light intensity was analysed in response to changes in the duration of the light flash, the respiratory phase during stimulation and the age of the subjects. The method of infrared pupillography was used to determine dynamic time parameters. With increasing duration of the light flash from 8 to 125, 250 and 500 ms we observed an acceleration of the latencies whilst the other time parameters were prolonged. There was no significant influence of the time of stimulation during the respiratory cycle. With growing age increased latencies and reduced time parameters of the pupillomotoric transient response were found. The possible reason and importance of the observed changes are discussed.