A Study on Pupillary Response to Depth Cue of Linear Perspective

Abstract

Accommodation, convergence and pupil constriction, which are called near triad, will usually respond simultaneously at near reflex in natural view condition. It has been reported that accommodation will happen to respond not only to visual distance of a real object but also by psychological factor in relation to perspective, but no research has been made on pupil behavior as another element of near reflex which would be correlated to psychological perspective.
Laboratory experiments were conducted on several subjects, to examine pupillary response by psychological factor to an image with linear perspective on the display, by using Eye-Sensing Head Mounted Display (ES-HMD). The ES-HMD can monitor the user's both eyes and obtain ocular information such as pupil size, eyeblink or eye movement, while presenting visual stimulus to his both eyes.
It was found that for some subjects pupil would respond by psychological factor for the perspective image, which is similar to near reflex of pupil, and its response is correlated with psychological distance given by the image.