Optical apparatus for obtaining measurements of portions of the

Details Optical apparatus for obtaining measurements of portions of the Optical apparatus for obtaining measurements of portions of the

1976-01-19

1977-04-26

Sacher, Paul A.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Folding

178DIG36, 351 6, 351 40, A61B 310, A61B 314

Patent

active

040198138

ABSTRACT:
An optical apparatus for obtaining one or more measurements of portions of an eye having means for providing a narrow beam of light through the eye, a lens system that collects light that is reflected from the eye and forms an image on the surface of a television camera tube and including means for determining when the narrow beam of light passes through the center of curvature of the cornea and when the instrument is correctly positioned for proper focus on the eye. Means are connected to the television camera for receiving and processing the video signals while the camera scans the image of the eye for measuring various portions of the eye such as the thickness of the cornea, the curvature of the leading edge of the cornea, the depth of the anterior chamber, the thickness of the lens, the transparency of the cornea, the transparency of the aqueous humor, and the transparency of the lens.

REFERENCES:
patent: 3536384 (1970-10-01), Cocks
patent: 3639041 (1972-02-01), Cornsweet
patent: 3740468 (1973-06-01), Gardner et al.
patent: 3908079 (1975-09-01), Worthley
patent: 3909519 (1975-09-01), Page, Jr.
patent: 3980870 (1976-09-01), Kawahara
George Cocks, "An Instrument for Measuring the Contour of the Cornea," Applied Optics, vol. 7, No. 1, pp. 151-154, Jan. 1968.

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