Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1994-10-05
1996-02-13
Sikes, William L.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351221, 351205, A61B 310
Patent
active
054915244
ABSTRACT:
Optical coherence tomography ("OCT") corneal mapping apparatus includes an OCT apparatus having a rotating helical mirror for altering a reference beam path in the OCT apparatus; a raster scanner for raster scanning sampling optical output from the OCT apparatus; a curved mirror for transferring the sampling optical output from the raster scanner to an eye and for transferring sampling optical output reflected from the eye back to the OCT apparatus through the raster scanner; and an analyzer, coupled to the raster scanner, the rotating helical mirror, and reference and sampling interaction output from the OCT apparatus. The analyzer causes the raster scanner to scan the sampling optical output to points in a raster; causes the rotating mirror to alter the length of the reference beam path over a predetermined amount at each of the points in the raster; and provides the corneal mapping from the reference and sampling interaction output at the points in the raster.
REFERENCES:
New Equipment and Methods for Determining the Contour of the Human Cornea by M. G. Townsley, Contacto, 11(4), 1967, pp. 72-81.
Accuracy and Precision of Heratometry, Photokeratoscopy, and Corneal Mapping on Calibrated Steel Balls by S. B. Hannush et al., Arch. Ophthalmol. vol. 107, Aug. 1989, pp. 1235-1289.
Intraoperative raster photogrammetry--the PAR Corneal Topography System by U. W. Berlin, J. Cataract Refract Surg. vol. 19, Suppl, 1993, pp. 188-192.
Micron--Resolution Imaging of the Anterior Eye in Vivo with Optical Coherence Tomography by J. . Izatt et al., 1994, pp. 1-24.
Optical Coherence Tomography by D. Huang et al., Science, vol. 254 22 Nov., 1991 pp. 1178-1181.
Optical Coherence-domain reflectometry: a new optical evaluation technique by R. C. Youngquist et al., Optics Letters, vol. 12, No. 3, Mar. 1987, pp. 158-160.
Measurement of Corneal thickness by low-coherence interferometry, C. K. Hitzeinberger, Applied Optics, vol. 31, No. 31, Nov. 1, 1992 pp. 6637-6642.
Measurement of the axial eye length and retinal thickness by laser Doppler interferometry (LOI), C. K. Hitzenberger et al., SPIE vol. 1423 Ophthal Tech. 1991 pp. 46-50.
Micron--Resolution Ranging of Cornea Anterior Chamber of Optical Reflectometry, D. Huang et al. Lasers in Surgery and Medicine, 11, 1991 pp. 419-425.
Hellmuth Thomas
Wei Jay
Carl Zeiss, Inc.
Dudek James A.
Einschlag Michael B.
Sikes William L.
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