Intraocular lens alignment using corneal center

Abstract

A method for generating a radial alignment guide for an eye includes collecting preoperative corneal topography data. The data includes a corneal vertex location and a pupil center location for an eye that is not dilated. The method then includes locating a dilated pupil center for the eye after the eye is dilated. The method further includes determining an adjusted offset between the corneal vertex and the dilated pupil center and displaying alignment data on an image of the eye based on the adjusted offset.

Description

[0001] related application [0002] This application claims priority to Provisional Application Serial No. 61 / 153,709 filed February 19, 2009 and Provisional Application Serial No. 61 / 155,562 filed February 26, 2009. Background technique [0003] Rotational orientation of intraocular lenses (IOLs) is becoming increasingly important for modern cataract surgery. Although complex algorithms involving automatic eye tracking have been developed to monitor pupil centers and corneal limbus during laser vision correction surgery, each of these algorithms requires the ability of the eye to actively fixate on a target. This approach may not be useful in procedures such as cataract surgery, where anesthesia, such as periocular anesthetic injections, is typically used, resulting in the inability of the eye to focus or fixate on a target voluntarily. Even when local anesthesia is used, the patient has difficulty maintaining fixation and cannot use the physiological pupil because the pupil...

AI Technical Summary

Problems solved by technology

Although sophisticated algorithms involving automated eye tracking have been developed to monitor pupil centers and limbus during laser vision correction surgery, each of these algorithms requires the ability of the eye to actively fixate on a target

The method may not be useful in procedures such as cataract surgery, where anesthesia is typically used, such as periocular anesthesia injections, resulting in the eye not being able to focus or fixate on a target voluntarily

Even when local anesthesia is used, the patient has difficulty maintaining fixation and cannot use the physiological pupil because the pupil must remain dilated as the IOL is inserted and rotated into place

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