Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1980-03-03
1982-12-21
Corbin, John K.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351214, A61B 310
Patent
active
043646468
ABSTRACT:
A position adjusting device attached to an ophthalmologic measuring instrument to accurately position an eye to be examined with respect to the ophthalmologic measuring instrument comprises projection means for projecting a predetermined projection pattern upon the eye to be examined, an objective lens group for observing therethrough the reflected image of the projection pattern by the cornea of said eye, a field stop provided at the image forming position of the objective lens group, a light-intercepting member provided near the objective lens group and having two openings outside of the optic axis of the objective lens group, a reflecting member obliquely disposed on the optic axis of the objective lens group rearwardly of and near the light-intercepting member, a position adjusting standard chart, and a projection lens for projecting the image of the standard chart onto the position of the field stop through the reflecting member.
REFERENCES:
patent: 890580 (1908-06-01), Sutcliffe
patent: 3864030 (1975-02-01), Cornsweet
patent: 3871772 (1975-03-01), Munnerlyn et al.
patent: 4252420 (1981-02-01), Kohayakawa
Bovernick Rodney
Corbin John K.
Nippon Kogaku K.K.
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