Wavefront sensor having multi-power beam modes, independent...

A - Human Necessities – 61 – B

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A61B 3/103 (2006.01) A61B 3/12 (2006.01) G01J 9/00 (2006.01)

Patent

CA 2385903

An improved wavefront sensor (300) is provided that enhances the initial focus and precision of imaged spots used to determine the monochromatic wave aberrations of the eye. The wavefront sensor includes an adjustment camera (323) that is independent of a lenslet camera (312). A laser (306) in a lower power mode is projected onto the retina of the eye and is brought into more precise or sharp locus by a control system employing data from the adjustment camera, which aids in focusing the imaged spots. "Trombone"-type optics (314) are used to adjust the focus of the light projected onto the retina and the imaged spots onto a sensor. The laser (306) has a higher power mode used when acquiring data of the imaged spots from the sensor.

L'invention concerne un capteur de front d'onde amélioré renforçant la mise au point initiale et la précision des points vus au moyen d'un instrument, qui est employé pour déterminer les aberrations d'onde monochromatique de l'oeil. Le capteur de front d'onde comprend une caméra de réglage indépendante d'une caméra à objectif. Un laser en mode d'alimentation faible est projeté sur la rétine de l'oeil et ce laser est mieux ou plus précisément mis au point par un système de contrôle utilisant les données provenant de la caméra de réglage, ce qui aide à ajuster les points vus au moyen d un instrument. Les dispositifs optiques de type </= Trombone >/= servent à régler la précision de la lumière projetée sur la rétine et les points vus par instrument sur le capteur. Le laser possède un mode d'alimentation fort, utilisé lorsque les données des points vus au moyen d'un instrument, provenant du capteur sont recueillies.

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