Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1989-10-03
1991-08-27
Bovernick, Rodney B.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351211, A61B 314, A61B 310
Patent
active
050429400
ABSTRACT:
An optical measuring apparatus for examining an eye which automatically aligns the optical axes of said apparatus and the eye with each other and focusing the light emitted by said apparatus on the eye. When these operations are accomplished, the projection of a measuring light is automatically started. The apparatus includes axes-aligning-focusing optical system. The optical system has a pair of optical axes-aligning light sources. Two images of beams emitted by the respective optical axes-aligning light sources and reflected by the cornea of the eye are detected by a light receiving sensor when the beams are focused substantially on the eye. Discriminating devices discriminate whether or not the optical axes of the two cornea-reflected images detected by the light receiving sensor align with the optical axis of the eye in Y-direction of the light receiving sensor. Discriminating devices discriminate whether or not the optical axes of the two cornea-reflected images detected by the light receiving sensor align with the optical axis of the eye in X-direction of the light receiving sensor. It is not until the optical axes-aligned and in-focus states are obtained that the measuring light is projected on the eye.
REFERENCES:
patent: 4678297 (1987-07-01), Ishikawa et al.
patent: 4712894 (1987-12-01), Nunokawa
patent: 4744648 (1988-05-01), Kato et al.
patent: 4817620 (1989-04-01), Katsuragi et al.
Bovernick Rodney B.
Price Joseph W.
Ryusyo Industrial Co., Ltd.
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