Indicating an asphericity of the cornea of an eye

Details Indicating an asphericity of the cornea of an eye Indicating an asphericity of the cornea of an eye

1974-07-17

1977-09-06

Corbin, John K.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Folding

356124, A61B 310, G01B 900

Patent

active

040464636

ABSTRACT:
A circular array of twelve light sources transmit light to an eye. A spherical shape of the cornea of the eye is indicated when light reflected therefrom appears to be transmitted from twelve virtual light sources disposed along a circular path within the eye. Correspondingly, an aspherical shape of the cornea is indicated when the virtual sources appear to be disposed along an acircular path within the eye. The array may be disposed within a light reflecting groove which collects ambient light which is transmitted to the eye. A reflection of the collected light appears to be a ring of light which connects the virtual sources.

REFERENCES:
patent: 3127113 (1964-03-01), Tomkinson
patent: 3248162 (1966-04-01), Knoll
patent: 3264932 (1966-08-01), Hendricks
patent: 3542458 (1970-11-01), Volk
patent: 3590232 (1971-06-01), Sadowski

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