Automatic keratometric measuring method and device for implementing said method
AssigneeLuneau, S.A.
InventorsJean-Pierre Lormois, Patrick Lafond
Life of this patent
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Abstract
The device comprises a luminous source 3 in the form of a circular ring, an optical doublet 4 and a matrix camera 5 on the lens of which the doublet 4 carries the elliptic image of the source 3 given by the cornea 2 of the eye 1. An electronic card 15 connected to the outlet of the matrix camera 5 supplies from a video signal, made up of a plurality of video lines and derived from the camera 5, a plurality of numerical values describing the elliptic image. A microprocessor element 19 receives and processes this plurality of numerical values so as to extract the value information from the large bending radius, the small bending radius and the angular position of the main axis of the cornea 2.
Claims6
Automatic keratometric measuring method consisting of placing a circular crown-shaped luminous source in front of the cornea of the eye to be examined, and of processing numerical information relating to the elliptical image of the crown given by the cornea extracting the values of the large and small bending radii and the angular position of the principal axis of the cornea, wherein the elliptical image given by the cornea transforming into an electronic-video signal constituted by a series of electronic-video lines each corresponding to one horizontal line of the elliptical image and whose amplitude depends on the contrast of the image with respect to its background, and wherein a measurement is made on each electronic-video line of the signal of time indications characterizing portions of the image belonging to the corresponding horizontal line of the image, and wherein all the time indications corresponding to a series of electronic-video lines of the signal are processed on a computer with the aid of a suitable software.
An automatic keratometric measuring device including a circular crown-shaped luminous source, a matrix camera allowing a measure to be performed, about a hundred points, a lens forming the image of the luminous source given by the cornea of the eye to be examined, an electronic card connected to the output of the matrix camera and supplying, from the video signal formed by a plurality of video lines and supplied by the matrix camera, a plurality of numerical values describing the elliptical image, and a microprocessor element receiving and processing said plurality of the numerical values so as to extract information concerning the value of the large and small bending radii and the angular position of the principal axis of the cornea.
Dependencies are inferred from the claim text.