Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1990-03-16
1991-11-05
Dzierzynski, Paul M.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351221, A61B 310
Patent
active
050627023
ABSTRACT:
A device for mapping the topography of the cornea of an eye has a light source for directing a beam of collimated monochromatic light characterized by a flat wave front onto the cornea. Positioned between the light source and the cornea is an objective lens for focusing this flat wave front toward the cornea as a converging spherical wave front. The light reflected from the cornea passes back through the objective lens to establish a reflected wave front having deviations from the flat wave front caused by aberrations on the cornea that are indicative of corneal topography. This reflected wave front is then segmentally focused by a lens array into a pattern which reveals the deviations for use in mapping the topography of the cornea.
REFERENCES:
Ronald Cubalchini, Modal Wave-Front Estimation from Phase Derivative Measurements.
W. H. Southwell, Wave-Front Estimation from Wave-Front Slope Measurements, Optical Society of America, vol. 70, No. 8, Aug. 1980, pp. 998-1005.
H. C. Howland, Objective Technique for the Determination of Monochromatic Aberrations of the Human Eye, Optical Society of America, vol. 1, No. 9, Sep. 1984, pp. 987-992.
Klaus R. Freischlad and Chris L. Koliopoulos, Modal Estimation of a Wave Front from Difference Measurements Using the Discrete Fourier Transform, Optical Society of America, vol. 3, No. 11, Nov. 1986, pp. 1852-1861.
Stephen D. Klyce and Steven E. Wilson, Imaging, Reconstruction, and Display of Corneal Topography, New Methods in Microscopy and Low Light Imaging, vol. 1161, 1989, pp. 409-416.
J. F. Bille, B. Grimm, J. Liang, K. Mueller, Imaging of the Retina by Scanning Laser Tomography New Methods in Microscopy and Low Light Imaging, vol. 1161, 1989, pp. 417-425.
Phillip C. Baker, Holographic Contour Analysis of the Cornea, New Methods in Microscopy and Low Light Imaging, vol. 1161, 1989, pp. 426-437.
Modal Wave-Front Estimation from Phase Derivative Measurements.
Dzierzynski Paul M.
Intelligent Surgical Lasers Inc.
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