Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1985-09-30
1987-11-03
Bovernick, Rodney B.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
354 62, A61B 314
Patent
active
047040181
ABSTRACT:
An eye fundus observing and photographing apparatus has an illuminating optical system for supplying illuminating light to an eye to be examined, an optical system for observing and photographing the fundus of the eye to be examined through an observation aperture stop, and an objective lens common to the illuminating system and the observing and photographing system. The objective lens is comprised of a first component which is a cemented positive meniscus lens having its concave surface facing the eye to be examined and a second component which is a cemented positive meniscus lens having its concave surface facing the observation aperture stop. The center of curvature of the concave surface of the first component which is adjacent to the eye to be examined is coincident with a position conjugate with the observation aperture stop with respect to the entire objective lens. The center of curvature of the concave surface of the second component which is adjacent to the observation aperture stop is coincident with the position of the observation aperture stop. A position conjugate with the observation aperture stop with respect to the reflected illuminating light on the cemented surface of the first component and a position conjugate with the observation aperture stop with respect to the reflected light of the illuminating cemented surface of the second component are substantially coincident with each other. The magnifications of the images of the observation aperture stop by the reflection on the cemented surfaces of the two components are substantially coincident with each other.
Bovernick Rodney B.
Dzierzynski D. M.
Nippon Kogaku K.K.
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