CA2172284A1 - Processing of Keratoscopic Images Using Local Spatial Phase - Google Patents

Processing of Keratoscopic Images Using Local Spatial Phase

Info

Publication number
CA2172284A1
CA2172284A1 CA2172284A CA2172284A CA2172284A1 CA 2172284 A1 CA2172284 A1 CA 2172284A1 CA 2172284 A CA2172284 A CA 2172284A CA 2172284 A CA2172284 A CA 2172284A CA 2172284 A1 CA2172284 A1 CA 2172284A1
Authority
CA
Canada
Prior art keywords
processing
distances
images
corneal surface
local spatial
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA2172284A
Other languages
French (fr)
Other versions
CA2172284C (en
Inventor
Richard J. Mammone
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tomey Co Ltd
Original Assignee
Richard J. Mammone
Computed Anatomy, Incorporated
Tomey Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Richard J. Mammone, Computed Anatomy, Incorporated, Tomey Co., Ltd. filed Critical Richard J. Mammone
Publication of CA2172284A1 publication Critical patent/CA2172284A1/en
Application granted granted Critical
Publication of CA2172284C publication Critical patent/CA2172284C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
    • G01B11/255—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures for measuring radius of curvature
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
    • A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
    • A61B3/107—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions for determining the shape or measuring the curvature of the cornea

Abstract

Quantitative measurement of corneal surface topography is obtained by processing a two-dimensional image of the surface (6) which reflects a quasi-periodic illuminated pattern, such as a series of concentric rings (13), from a Placido disk source. The local spatial phases exhibited by the image of the illuminated pattern when reflected from the corneal surface and when reflected from standard specular surfaces are obtained by processing the images (42). The distances at which predetermined local spatial phases are observed in the image from the cornea are compared (42) with the distances at which these same phases are observed in the images of the standard surfaces. The distances are also compared (42) with certain corresponding distances on the source and converted to reveal the dioptric powers of refraction of the corneal surface without the need for parametric interpolation. During processing, any mislocation of the apex of the corneal surface along the optical axis is compensated for.
CA002172284A 1994-08-08 1995-06-07 Processing of keratoscopic images using local spatial phase Expired - Fee Related CA2172284C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US28712694A 1994-08-08 1994-08-08
US287,126 1994-08-08
PCT/US1995/007214 WO1996004839A1 (en) 1994-08-08 1995-06-07 Processing of keratoscopic images using local spatial phase

Publications (2)

Publication Number Publication Date
CA2172284A1 true CA2172284A1 (en) 1996-02-22
CA2172284C CA2172284C (en) 1999-09-28

Family

ID=23101567

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002172284A Expired - Fee Related CA2172284C (en) 1994-08-08 1995-06-07 Processing of keratoscopic images using local spatial phase

Country Status (4)

Country Link
EP (1) EP0722285A4 (en)
JP (1) JP3010072B2 (en)
CA (1) CA2172284C (en)
WO (1) WO1996004839A1 (en)

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Also Published As

Publication number Publication date
JP3010072B2 (en) 2000-02-14
CA2172284C (en) 1999-09-28
EP0722285A1 (en) 1996-07-24
EP0722285A4 (en) 1998-11-04
JPH08510949A (en) 1996-11-19
WO1996004839A1 (en) 1996-02-22

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