Keratometer

Details Keratometer Keratometer

1980-07-14

1982-10-26

Rosenberger, R. A.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Folding

356376, 356390, A61B 310

Patent

active

043558712

ABSTRACT:
In an optical beam-doubling and image-rotating device, beam splitting means are provided for creating a first and a second image of an optical target in conjunction with means for rotating the light-ray family associated with the second image yielding a second image which has been rotated axially through a defined angle with respect to the first image, in further conjunction with additional beam splitting means so disposed as to combine the first and rotated second images so that they may be visually compared under the conditions of a specifically defined relative angular displacement. The disclosed use is in measuring the sphericity of the cornea of the eye during ophthalmic surgery.

REFERENCES:
patent: 3248162 (1966-04-01), Knoll
patent: 3264932 (1966-08-01), Hendricks
patent: 3288021 (1966-11-01), Hopkins
patent: 3482904 (1969-12-01), Volk
patent: 3969019 (1976-07-01), Nohda
patent: 4046463 (1977-09-01), La Russa et al.
patent: 4157859 (1979-06-01), Terry
patent: 4172639 (1979-10-01), Lang et al.

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