[The dependence of the parasympathetic reaction of the mesencephalic section of the brain stem to age-, sex- and pigment-reagent-related factors].

Photoelectron pupillograph measurements of pupillary responses to light were made in 198 healthy individuals. Photoreaction of the pupils was declining with age contrary to the reciprocity rate which was stable (3.01-3.56). It indicates on the relative stability of parasympathetic-sympathetic relations. Young males with hyperpigmented irises had hyperactive parasympathetic reaction which sharply decreased to normal values at the age of 26-30 years. Estimated standard values of time, strength and speed of pupillomotor reaction can be used for comparative evaluation of autonomic neuromotor and brain structures involvement in various neurological diseases. These values may serve as initial point for devising medical algorithms and computer programs.