Patent attributes
There is provided a method of measuring a pupil distance, which includes locating an imaging device at a position a predetermined distance away from a member attached to eyeglasses worn by a subject. The member has two indicators. The method further includes photographing the subject while the subject observes an observing point in the vicinity of the imaging device, measuring an apparent distance E between left and right pupils on a photographed image, and obtaining an interpupillary distance PD in accordance with PD=[(A+B)×C×E]/(A×D) where “A” represents a distance between the member and the imaging device, “B” represents a distance between a center of rotation and the member, “C” represents an actual distance between the indicators, and “D” represents an apparent distance between the indicators.
