System for characterizing a cornea and obtaining an...

A - Human Necessities – 61 – B

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A61B 3/107 (2006.01) A61B 3/028 (2006.01) A61B 5/00 (2006.01) A61F 2/16 (2006.01)

Patent

CA 2754775

A system for determining the shape of a cornea of an eye illuminates at least one of the interior surface, the posterior surface, and the interior region of the eye with infrared light of a wavelength that can generate fluorescent light from the portion of the cornea illuminated. The generated fluorescent light is then detected. A step of illuminating can comprise focusing the infrared light in a plurality of different planes substantially perpendicular to the optical axis of the eye. From the detected light it is possible to create a map of at least a portion of the interior surface, at least a portion of the posterior surface, and/or portion of the interior region of the cornea. Clarity of vision can be determined by generating autofluorescence from proteins in the pigment epithelial cells of the retina.

La présente invention concerne un système, permettant de déterminer la forme de la cornée d'un il, qui éclaire la surface intérieure, et/ou la surface postérieure et/ou la région interne de l'il, au moyen d'une lumière infrarouge dont la longueur d'onde permet de générer une lumière fluorescente depuis la partie de la cornée éclairée. La lumière fluorescente ainsi générée est ensuite détectée. L'étape de l'éclairage peut consister à focaliser la lumière infrarouge en une pluralité de différents plans sensiblement perpendiculaires à l'axe optique de l'il. Il est possible, à partir de la lumière détectée, de créer une carte d'au moins une partie de la surface intérieure, d'au moins une partie de la surface postérieure et/ou d'une partie de la région interne de la cornée. Il est également possible de déterminer la clarté de la vision en générant une auto-fluorescence à partir des protéines des cellules épithéliales pigmentaires de la rétine.

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