Hoya Corporation

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Takashi Hatanaka

Volkhard Schroth

Wolfgang Jaschinski

A prism prescription value acquisition system that includes a calculation part for numerically transforming a fixation disparity amount (unit: angle), which indicates a degree at which the visual axis is shifted from the central fovea of the retina when a subject conducts visual fixation of a target, into a prism prescription value by multiplying the fixation disparity amount by a coefficient when the fixation disparity amount is within &#xb1;4 minutes. Herein, the prism prescription value is calculated according to the following equation: AP=k*FD, AP=k*FDproviding that each of coefficients kand ksatisfies the following conditions: 0.3&#x2266;k&#x2266;0.7, 1.4&#x2266;k&#x2266;2.0.

Prism prescription value acquisition system, acquisition method, acquisition apparatus and program for correcting fixation disparity

A spectacle measuring tool () includes a front plate () attached to a spectacle frame, and a pair of left and right side plates (A,B) formed on the two, left and right edges of the front plate () to extend backward. The front plate () includes an interpupillary distance measuring portion (A) and a fitting point height measuring portion (B), and is attached to the spectacle frame such that a height adjusting device () can adjust its height. The side plates (A,B) include a pair of left and right pressing/adjusting devices () which adjust the side plates (A,B) to be parallel to the temples of the spectacle frame. The pressing/adjusting devices () press against the face side portions of a subject using threaded rods ().

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Dronten, Netherlands

Hans Warntjes