Method for determining distances in the anterior ocular segment

Details Method for determining distances in the anterior ocular segment Method for determining distances in the anterior ocular segment

A - Human Necessities

61

B

A61B 3/11 (2006.01) A61B 3/113 (2006.01)

Patent

CA 2417776

The invention relates to a method for determining distances in the anterior ocular segment, preferably of the pupils and/or the diameter of the iris, wherein the image of at least part of the eye is recorded and digitized using an imaging device and an array for illuminating the eye. On the basis of said digital image, a center of gravity analysis and the determination of the central point are carried out, especially for the position of the pupils, by conducting an intensity and threshold analysis as rough determination. Based on said rough determination, a fine detection of the position of the edges of the pupil and/or the edges of the iris is carried out. Additionally, the angle between the visual axis and the optical axis of the eye can be determined from the position of a fixed reflection to the center of the pupil and/or the center of the iris.

L'invention concerne un procédé permettant de déterminer des distances dans la section avant de l'oeil, de préférence, dans la pupille et/ou le diamètre de l'iris. Ce procédé consiste à enregistrer et à numériser l'image d'au moins une partie de l'oeil à l'aide d'une unité d'enregistrement d'image et d'un dispositif d'éclairage de l'oeil. Sur la base de cette image numérique, on effectue notamment pour la position de la pupille une analyse du centre de gravité comme détermination approximative par une analyse de seuil d'intensité et une analyse de point central. Sur la base de cette détermination approximative, on effectue une fine détection de la position des bords de la pupille et/ou des bords de l'iris. En plus, on détermine l'angle entre l'axe visuel et l'axe optique de l'oeil à partir de la position d'une réflexion fixe sur le centre de la pupille et/ou le centre de l'iris.

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