| 摘要 |
A lens meter in which a measuring light flux is projected against a lens to be examined and the optical characteristics of the examined lens are measured in reference to the position of an image formed on a light receiving element by the measuring light flux passed through the examined lens, comprises a device changing-over to a mode for measuring an additive diopter of a progressive focus lens, a device for measuring the refractive power of the lens continuously, a device for sensing a reference position having a predetermined optical characteristics of the progressive focus lens, a device for sensing dislocation between each measuring position and the reference position by sensing movement distance of the lens, a device for determining whether the value of the additive diopter obtained on the basis of the measurement by the measuring device is biggest or not, a device for storing the measuring position by the position sensing device when the value of the additive diopter is biggest, and a device for displaying the measuring position when the value of the additive diopter is biggest. In case of that, the lens meter comprises a device for dividing measurement process in the additive diopter measuring mode into plural measurement processes and displaying the respective measurement process, a device for generating a process change signal of respective measurement process divided as above, and a device for indicating the measurement process of the present time among the plural measurement processes.
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