Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Subjective type
Patent
1987-08-28
1989-02-07
Buczinski, Stephen C.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Subjective type
351206, 351224, A61B 302, A61B 314
Patent
active
H00005746
ABSTRACT:
An instrument for the self-examination of the eye of a subject is described which comprises a housing including a controllable light source for selectively illuminating the eye, an optical system for projecting along an optical axis an image of the eye so illuminated, photographic film for recording the image, the optical system being sized to provide a predetermined magnification of the image on the film, a transparent grid plate disposed along the optical axis between the light source and film for superimposing a set of calibrated lines onto the image of the eye, and a controllable shutter in the optical system for selectively exposing the film to the superposition of the images of the eye and of the calibrated lines. A flexible light shield surrounds the light source for resiliently contacting the contour of the face of the subject whereby extraneous light is excluded.
REFERENCES:
patent: 3533683 (1970-10-01), Stark et al.
patent: 3787112 (1974-01-01), Lyons
patent: 3797921 (1974-03-01), Kilmer et al.
patent: 4423931 (1984-01-01), Shapiro
patent: 4586796 (1986-05-01), Molteno
Merkel Harold S.
Ramer David P.
Buczinski Stephen C.
Scearce Bobby D.
Singer Donald J.
The United States of America as represented by the Secretary of
Wallace Linda J.
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