| 摘要 |
A measuring device which can be used when corrective lenses having a progressively varying focal strength are mounted on the rims of a spectacle frame. This device allows the compatibility of said lenses with said frame and with the user, and the monocular measurement of the vertical position of the pupils of the user's eyes with respect to the internal lower edge of the said rims to be checked. The device comprises a preferably opaque or colored support, means for removable mounting and maintaining said device in the groove of one of the rims, a reference element vertically movable within a recess provided in said support, a stop provided at the lower portion of said recess, and at least one measuring scale provided on said support in front of said reference element.
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