Apparatus for measuring interpupilary distance of mounted spectacles

摘要

A lens meter for measuring the optical character of spectacle lenses by projecting a measurement target onto the spectacle lens comprises a first position control member for moving a spectacle frame in a horizontal direction, and a second position control member for moving the spectacles in a direction perpendicular to the direction of the first position control member. The position of the second position control member is detected by a potentiometer, and the pupilary distance is calculated based on the distances from the second position control member to the bridge center of the spectacle frame and to each lens optical center on the spectacle frame.