Patent attributes
A lens meter having a measurement-optical system including a light source which projects and a light-receiving sensor which receives a light beam having passed through the lens; an arithmetic part which obtains optical characteristics of the lens from results received by the light-receiving sensor; mode selecting device which selects between a single-focal-lens-measurement mode and a progressive-lens-measurement mode; detecting device which detects directions and degrees of displacement of measurement positions from a near-vision portion of a progressive lens based on optical characteristics obtained when the progressive-lens-measurement mode is selected and alignment is made to bring the measurement position into the near-vision portion; a display which displays an alignment screen; and a display-control part which causes the display, based on detection results by the detection device, to display a guide mark indicating a direction and an amount that the lens must be moved to bring the measurement position into the near-vision portion.
