| 摘要 |
A lens meter projects measuring light onto a lens, detects the measuring light traveled through the lens at a light detecting element, and determines the optical characteristics of the lens on the basis of the detected data obtained from the light detecting element. The lens meter provides a display device for displaying the relation to adjust the lens to the optical axis of the measuring optical path, measuring mode selector device for selecting a measuring mode from a single focus lens measuring mode to a progressive focus lens measuring mode, a control device for measuring the lens at position measuring points distributed at predetermined intervals on the lens successively on a measuring optical axis and measuring the refractive power of the lens at each measuring point. A dislocation between a vertical standard line, on which a measuring position of the refractive power of the far viewing section, crossing a horizontal standard line on a progressive focus lens and passing through a geometrical center thereof is calculated based on the refractive power of the progressive focus lens at each measured position, and a measuring optical axis of the measuring optical path, and a movement conducting mark is displayed on the display device to conduct the measuring to the vertical standard line direction based on the calculated data.
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