Combination advanced corneal topography/wave front aberration measurement

a technology of topography and aberration, applied in the field of combination advanced corneal topography/wave front aberration measurement, can solve the problems of inability to realize vision extension in a real system, prior art devices are unable to measure the peripheral cornea, and the patient's brow and nose are prone to imping

a technology of topography and aberration, applied in the field of combination advanced corneal topography/wave front aberration measurement, can solve the problems of inability to realize vision extension in a real system, prior art devices are unable to measure the peripheral cornea, and the patient's brow and nose are prone to imping

US20010033362A1Inactive Publication Date: 2001-10-25LASERSIGHT TECH
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  • Combination advanced corneal topography/wave front aberration measurement
  • Combination advanced corneal topography/wave front aberration measurement
  • Combination advanced corneal topography/wave front aberration measurement

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Experimental program
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Embodiment Construction

[0059] The present invention improves upon prior art by (1) using the proven accuracy of the keratometric target in a novel way to obtain full limbus-to-limbus coverage on the corneal front surface; (2) obtaining surface measurements of the corneal back surface using both a new projected light and a new ray tracing approach; (3) obtaining corneal thickness information from the corneal surfaces; (4) obtaining wave front aberration information for the entire eye using a multiple resolution micro-lens array technique; and (5) obtaining all these measurements simultaneously.

[0060] One embodiment of the invention consists of the corneal measurement components, the wave front aberration components, the computer, and the software as described below.

[0061] In FIG. 1 we show a block diagram of the major components of the advanced corneal topography / wave front aberration measurement (ACT / WAM) system. The system consists of a keratometric target source (K1) with illumination source (not shown)...

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Abstract

A method and apparatus for the simultaneous measurement of the anterior and posterior corneal surfaces, corneal thickness, and optical aberrations of the eye. The method employs direct measurements and ray tracing to provide a wide range of measurements for use by the ophthalmic community.

Description

[0001] This application is a continuation of U.S. Pat. No. 6,234,631 entitled "Combination Advanced Corneal Topography Wave Front Aberration Measurement", filed Mar. 9, 2000, and issued May 22, 2001, the entirety of which is expressly incorporated herein by reference.[0002] 1. Field of the Invention[0003] This invention relates generally to apparatus for use in determining the front and back contours of the cornea of a human eye and thus facilitating the diagnosis and evaluation of corneal anomalies, design and fitting of contact lens, and the performance of surgical procedures. The present invention also relates to the field of measurement of the refractive characteristics of an optical system, and more particularly, to automatic measurement of the refractive characteristics of the human or other animal eye and to corrections to the vision thereof.[0004] 2. Background of Related Art[0005] Corneal Front Surface Measurements[0006] The cornea, being the front surface of the eye, provi...

Claims

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Application Information

Patent Timeline
25 Oct 2001
Publication
US20010033362A1
IPC
A61B3/10; A61B3/103; A61B3/107; A61B3/12
CPC
A61B3/1005; A61B3/1015; A61B3/107
Inventors
SARVER, EDWIN J.