RECIPROCAL INNERVATION OF THE SPHINCTER AND DILATOR PUPILLAE

Abstract

An infrared method of photography is described by which the rate of change of pupil diam. during dark adaptation may be followed. If certain assumptions are accepted, the dilator muscle should contract throughout the whole course of dilatation, but relaxation of the sphincter ceases after approximately 20 sec. when the process is about 2/3 complete. Dilatation of the pupil is slower and never so complete if the sympathetic nerve is cut. The 2 eyes are independent, there being no traces of consensual light reflex.