Patient fixation system and method for laser eye surgery

A - Human Necessities – 61 – F

Patent

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Details

A61F 9/01 (2006.01) A61F 9/008 (2006.01)

Patent

CA 2333054

The invention enhances the alignment between the eye (E), and a laser beam (14) of a laser eye surgery system (10) using a visual fixation system (38), the fixation system (38) often having an adjustable optical train (58). The optical train (58) of the fixation system (38) allows an eye (E) having a significant refractive error to be accurately focused at a fixation target (60). To accommodate the refractive error, the adjustable optical train (58) will often project an image of the target (60) so that the projected image is in focus in front of or behind the plane of the patient's eye (E). The present invention also encompasses the calculation of the proper projection distance to accommodate the refractive error of the eye (E), the calculation preferably based at least in part on the eye glass prescription for that eye (E).

La présente invention concerne une amélioration de l'alignement entre l'oeil (E) et un faisceau laser (14) d'un système de chirurgie ophtalmologique par laser (10) mettant en oeuvre un système de fixation visuelle (38), lequel système de fixation (38) comporte souvent un train optique réglable (58). Le train optique (58) du système de fixation (38) fait qu'un oeil (E) affecté d'un défaut de réfraction caractérisé vient se focaliser avec précision sur la mire de fixation (60). Pour prendre en compte ce défaut de réfraction, le train optique réglable (58) projette systématiquement une image de la mire de façon que l'image projetée se trouve focalisée en avant ou en arrière du plan de l'oeil du patient (E). L'invention se rapporte également au calcul de la distance de projection convenant à la prise en compte de du défaut de réfraction de l'oeil (E). Ce calcul s'appuie en partie au moins sur la formule du verre correcteur de l'oeil considéré (E).

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