Abstract: An improved device for measuring the interpupillary distance of the eyes of a person is provided. The device has a frame having a first hole which is positionable at the pupil of the person's left eye, and a disk mounted juxtaposed to the frame which is rotatable about an axis perpendicular to the face of the frame. The disk has a plurality of second holes, extending through the disk from its surface, which spiral radially outward on said disk from the axis. By rotating the disk, one of the second holes is viewable through a window in the frame and positionable at the pupil of the person's right eye. The interpupillary distance is equal or approximately equal to the distance between the centers of the first and second holes when the holes are positioned at the respective pupils of the person. Numerals representing this distance appear on the surface of the disk through another window in the frame.