Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1998-04-29
1999-11-02
Manuel, George
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351221, A61B 310
Patent
active
059756993
ABSTRACT:
Embodiments of the present invention are method and apparatus for simultaneously measuring the length and refractive error of an eye, preferably in a non-contact mode. In particular, an embodiment of the present invention is an apparatus which measures length and refractive error of an eye which includes: (a) a source of short coherence radiation which couples radiation into a Michelson interferometer, the arms of the Michelson interferometer having a predetermined optical pathlength difference; (b) an injector which couples radiation output from the interferometer into the eye; and (c) a relay system which couples radiation output from the eye to a spectrometer; wherein the spectrometer measures displacement of radiation to measure the refractive error and the spectrometer measures density of fringes to measure the length.
REFERENCES:
patent: 3822932 (1974-07-01), Humphrey
patent: 4541697 (1985-09-01), Remijan
patent: 4650301 (1987-03-01), Humphrey
patent: 5490849 (1996-02-01), Smith
Optical Coherence Tomography by A. F. Fercher, J. Biomedical Optics, vol. 1, No. 2, pp. 157-173, Apr., 1996.
"Sensors in Ophthalmology" by T. Hellmuth, at pp. 290-323 in a book entitled "Sensors Update," ed. by H. Baltes, W. Gopel, and J. Hesse, Published by Wiley-VCH Verlag GmbH, Weinheim, Germany in 1998.
Carl Zeiss, Inc.
Einschlag Michael B.
Manuel George
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