System and method with refractive corrections for controlled placement of a laser beam's focal point

摘要

A methodology is provided for correcting the placement of a laser beam's focal point. Specifically, this correction is done to compensate for displacements of the focal point that may be caused when implant material (e.g. an Intraocular Lens (IOL)) is positioned on the optical path of the laser beam. The methodology of the present invention then determines a deviation of the laser beam's refracted target position (uncompensated) from its intended target position. A calculation of the deviation includes considerations of the laser beam's wavelength and refractive/diffractive characteristics introduced by the implant material. This deviation is then added to the refracted target position to make the refracted target position coincide with the intended target position of the focal point. The laser beam will then focus to its intended target position.

主权项

1. A method for correcting the placement of a laser beam's focal point outside an implant material to compensate for displacements of the focal point caused when the implant material becomes positioned on an optical path of the laser beam, the method comprising the steps of:
identifying an intended target position for the focal point of the laser beam, wherein the intended target position is outside the implant material and is identified relative to a reference datum; defining a volume of the implant material to include dimensional measurements of the volume, a refractive index of the implant material, and a configuration of the volume; orienting the optical path of the laser beam relative to the defined volume of implant material; calculating a refracted target position based on the orienting step, said refracted target position accounting for refractive optical characteristics introduced by the implant material; measuring a deviation between the intended target position and the refracted target position; focusing the laser beam along the optical path to the focal point; and correcting the focusing step to compensate for the deviation measured in the measuring step by making the refracted target position of the focal point substantially coincident with the intended target position.