Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Patent
1980-07-03
1982-04-06
Evans, F. L.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
351 14, 351 16, G02B 2106, A61B 312
Patent
active
043232990
ABSTRACT:
The present invention relates to a wide field specular scanning device, especially intended for the examination under magnification of a selected area within the cornea of the eye. The device includes a specular microscope incorporating a converging lens and an objective lens or a group or series of lenses performing the functions thereof. A beam of light from a light source is passed through the lenses of the microscope into the cornea of the subject through a reciprocating or oscillating mask or plate having a first slit to one side of the optical axis of the microscope through which the beam is passed and a second slit to the opposite side of said axis a predetermined distance from the first slit through which the reflected beam transmitted backward through the microscope is passed through a magnifying lens or other device either for direct observation or onto a screen or photo-sensitive surface. By oscillating the mask at a rate which is above the image retention rate of the eye, the observer may derive an accurate impression of a selected area within the cornea of the eye. A particular advantage of the device is that the image is of high contrast and only a minimal quantity of stray light fractions are incorporated in the image.
REFERENCES:
patent: 3518014 (1970-06-01), Weber
patent: 3547512 (1970-12-01), Baer
patent: 4170398 (1979-10-01), Koester
Colvin Arthur B.
Evans F. L.
Koren Matthew W.
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