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

A technology for implants, eye implants, applied in eye implants, laser surgery, intraocular lenses, etc., to solve problems such as aberrations, not performing as expected, etc.

Inactive Publication Date: 2009-07-15
ALCON INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, an IOL that may be best suited for a patient based on preoperative visual acui...

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

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Embodiment Construction

[0018] The present invention generally relates to a method for designing an ocular implant, such as an intraocular lens (IOL), surgically implanted in a patient's eye, taking into account ocular aberrations caused, for example, by incisions in the cornea during surgery. Although the embodiments discussed below generally relate to methods for implanting an IOL into a patient's eye, the teachings of the present invention are equally applicable to other ocular implants, such as intercorneal implants. Furthermore, the term intraocular lens and its abbreviation "IOL" are used interchangeably herein to describe a lens that can be implanted inside the eye to replace or otherwise enhance vision, whether or not the natural lens is removed.

[0019] During cataract surgery, a small incision is made in the cornea, for example with a diamond blade. A tool can then be inserted through the corneal incision to cut a portion of the anterior lens capsule, usually in the form of a ring, to prov...

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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...

Claims

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Application Information

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IPC IPC(8): A61F2/16G02C7/04
CPCA61F2/14A61F2/16A61F2240/00A61F2240/001A61F2240/002A61F2/145A61F2009/00848A61F9/007G02C7/04A61F2009/00851A61F2/142
Inventor K·K·达斯张晓啸M·卡拉克雷洪昕
Owner ALCON INC
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