Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Subjective type
Patent
1995-11-29
1997-01-21
Dang, Hung X.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Subjective type
351222, 351246, A61B 302, A61B 300
Patent
active
055963781
ABSTRACT:
An eyeglass lens selection system for untrained persons includes a carrier that is slidably mounted in a viewer module. An eye chart faces the viewer module and an elongated arm connects the chart to the viewer module and lens carrier. The carrier is an elongated strip having a plurality of lenses along its length, each of the lenses has a different refractive power. The lenses are molded of polymethyl methacrylate in a one-piece lens/carrier assembly. In use, a prospective purchaser of eyeglasses looks with one eye at the eye chart through an opening in the viewer module and through a single lens on the carrier. The carrier is slidingly moved through the viewer module so that each lens, in turn, is used in viewing the eye chart until a clear image on the chart is obtained. The procedure is repeated for the other eye. The lenses that provide the clear images are identified from indicia on the carrier and eyeglasses are assembled from kits containing a large number of lenses in different optical strengths, and a selection of eyeglass frames that can accommodate the selected lenses.
REFERENCES:
patent: 763929 (1904-06-01), Reinhard et al.
patent: 4413891 (1983-11-01), Rybicki
patent: 4798457 (1989-01-01), Morohashi et al.
patent: 5220362 (1993-06-01), Blenkle
patent: 5285224 (1994-02-01), Sims
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