Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1988-12-27
1989-09-05
Bovernick, Rodney B.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351221, 351246, A61B 310
Patent
active
048632600
ABSTRACT:
Apparatus and method for accurately quantifying the instantaneous radius curvature of a large plurality of points on the corneal surface is disclosed. A video image of the corneal surface accurately positioned at a predetermined point on the optic axis of measurement is obtained. The predetermined point is defined by intersecting low power laser beams. The video image is radially scanned from an original position at point defined by the intersection of the visual axis with corneal surface. Accurate measurements of the two-dimensional image radii of a plurality of illuminated mires reflective upon the corneal surface are made and corrected for camera distortions, quantization error and the different magnification occurring for different size corneas. The instrumentation is calibrated by using a plurality of mirror-like spheres of precisely known spherical radii.
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patent: 4685140 (1987-08-01), Mount, II
"Planar Reflected Imagery in Photokeratoscopy", Journal of the Optical Society of America, S. Wittenberg & W. Ludlam, vol. 60, No. 7, Jul. 1970, pp. 981-985.
"Corneal Topography: A Clinical Model", Opthial. Physiol. Opt., M. Guillon, D. Lydon & C. Wilson, vol. 6, No. 1, pp. 47-56, 1986.
"Computer-Assisted Corneal Topography", Investigative Ophthalmology & Visual Science, S. Klyce, vol. 15, Dec. 1984, pp. 1426-1433.
"Method for Calculation of Corneal Profile and Power Distribution", Arch Opthalmol, J. Doss, R. Hutson, J. J. Rowsey, D. R. Brown, vol. 99, Jul. 1981, pp. 1261-1265.
Gersten Martin
Mammone Richard J.
Zelvin Joseph L.
Bovernick Rodney B.
Computed Anatomy Inc.
Dzierzynski P. M.
Popper Howard R.
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