Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Subjective type
Reexamination Certificate
2006-07-07
2008-12-30
Choi, William C (Department: 2873)
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Subjective type
C351S222000, C351S237000, C351S200000, C351S246000, C351S239000
Reexamination Certificate
active
07470026
ABSTRACT:
The present invention provides a method and apparatus for measuring operating vision. An optotype mark is displayed (step103). A subject's response to the optotype mark is accepted via an input device (step104). A determination is made as to whether or not the response is correct (step105). When the current response of the subject is correct and the previous response or one of the previous response and the last-but-one response is incorrect, an optotype mark corresponding to the same visual acuity is presented (step112). When the previous response is correct or both the previous response and the last-but-one response are correct, an optotype mark corresponding to a visual acuity one level higher is presented (step110). When the current response is incorrect, an optotype mark corresponding to a visual acuity one level lower is presented (step111).
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patent: 7393104 (2008-07-01), Hara et al.
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Krakau et al., “An automatic apparatus for time series analysis of visual acuity,” Vision Research, Pergamon Press (Oxford, GB), (vol. 7), (Issue. 1-2), (p. 99-105), (Jan. 1967).
Kaido Minako
Tsubota Kazuo
Choi William C
Dinh Jack
Hammer & Associates, P.C.
Kaido Minako
Qualitas Inc.
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