| 摘要 |
A lens meter obtaining 0D-reference-coordinates of target-images not detected in a reference state and measuring even progressive lenses, has a lens rest, an optical system having an optical axis (L1), a light source, (11) measurement targets (20) and a photo-sensor (15), a part calculating optical characteristics based on coordinates-change of target-images (21,22) in a measurement state with the lens (LE) on the rest and axis from those in a reference state without the lens (LE) thereon, and an information memory. The part makes the memory store image-coordinates not detected in the reference state obtained during assembly/adjustment, and based on image-coordinates detected in the reference state after power application and before measurement and stored coordinates, obtains image-coordinates not detected in the reference state after power application and before measurement, and calculates characteristics based on coordinates-change of target-images detected in the measurement state from those detected in the reference state before measurement and obtained image-coordinates.
|
