Patent ID: 7083280

Claim:
A pupil measuring apparatus comprising: a mark moving device for moving a position of a mark in a predetermined region from a reference position, said reference position being set at a position where two pupils are to be placed; an illumination optical system for illuminating said reference position; two cameras for respectively imaging said two pupils placed at said reference position; calculating means for calculating pupillary areas, pupillary diameters, or pupillary positions of the respective pupils imaged, from video signals of the two cameras; and a display for providing an output of a graph of change in said pupillary areas, pupillary diameters, or pupillary positions thus calculated against a position of said mark or a time associated with the position on a single screen; and background, observable beyond said mark when viewed from said reference position, for changing said pupillary areas or said pupillary diameters as a result of the two pupils recognizing said background together with said mark, wherein a near reflex characteristic associated with said two pupils is measured more accurately as a result of said recognition by said pupils of said background, and said illumination optical system illuminates said reference position from said background side.