Method of designing an intraocular lens implant for the correction of surgically-induced astigmatism

Abstract

In one aspect, the present invention provides a method of designing an ocular implant (e.g., an IOL), which comprises establishing corneal topography of a patient's eye, e.g., by performing one or more wavefront aberration measurements of the eye, prior to an ocular surgery. The method further includes ascertaining an astigmatic aberration of the cornea that is expected to be induced by the surgery and determining a toricity of a surface of an ocular implant, which is intended for implantation in the patient's eye, so as to enable the implant to compensate for the surgically-induced aberration.

Description

technical field [0001] The present invention relates generally to methods for designing ophthalmic lenses, and more particularly, to methods for customizing intraocular lenses (IOLs) to a patient's individual vision needs. Background technique [0002] An intraocular lens is usually implanted in a patient's eye during cataract surgery to replace the natural lens. During the procedure, a small incision is made in the patient's cornea through which a tool can be inserted into the eye to remove the natural lens and introduce an IOL. The incision is usually small enough that it can then heal without stitches. However, the incision, although healed, can still cause postoperative corneal aberrations including astigmatism, or alter pre-existing corneal aberrations including astigmatism. The astigmatism caused by this procedure can vary from patient to patient. Corneal astigmatic aberrations can occur because the curvature of the cornea is not equal in different directions around...

AI Technical Summary

Problems solved by technology

Therefore, an IOL that may be best suited for a patient based on preoperative visual acuity measurements of the patient may not perform as expected due to surgically induced aberrations

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