Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – For interpupillary distance measuring or lens positioning
Patent
1988-12-08
1990-07-31
Dzierzynski, Paul M.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
For interpupillary distance measuring or lens positioning
33200, A61B 310
Patent
active
049445855
ABSTRACT:
Since a certain relationship exists between a pupillary distance at a viewing distance and a pupillary distance to another viewing distance, the pupillary distance at a desired viewing distance can be obtained by making a predetermined correction in the results of a pupillary distance measurement at a fixed viewing distance, without requiring a convexed lens in the device to be moved. The fixed viewing distance is preferably set at a small value such as 1 to 2 meters so that problems such as failure in forming a fused image due to machine near sightedness can be avoided. The device has a sighting mark forming device which can be installed at any portion of the measuring device for enabling easy assembly, unlike conventional measuring devices which require that the sighting mark forming device is located in relation to the (corneal) vertex distance of the subject.
REFERENCES:
patent: 3495897 (1970-02-01), Deforges
patent: 4591246 (1986-05-01), Cousyn et al.
Dzierzynski Paul M.
Nidek Co. Ltd.
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