Enhanced wavefront ablation system
AssigneeVISX, Incorporated
InventorsJason Watson, John K. Shimmick
Life of this patent
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AssigneeVISX, Incorporated
InventorsJason Watson, John K. Shimmick
Estimating the term…
Systems and methods verify and/or correct optical errors of an eye. A plan is generated for a corrective procedure of the eye from a measured optical error, and a verification lens is formed based on the measured optical error to verify the procedure plan. Alignment of an aperture (with a size selected to correspond to the size of the pupil) with the eye while measuring optical properties of the eye through the verification lens improves verification accuracy, as does mounting of the verification lens and aperture to the patient with a trial frame.
A method comprising:
A method comprising:
A system for correcting an optical error of an eye, the system comprising:
A system for correcting an actual optical error of an eye, the system comprising:
A method for selecting an eye of a patient for refractive surgery, the method comprising:
A system for verifying a specific refractive error of a patient, the system comprising:
Dependencies are inferred from the claim text.
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For testing visual acuity; for determination of refraction, e.g. phoropters: trial frames; Sets of lenses for use therewith
Refractive treatments: correction of higher orders
For measuring interpupillary distance or diameter of pupils: for measuring diameter of pupils
Using laser: feedback systems
Term ended 2 Dec 2021 (estimated)
Field of the Invention
The present invention is generally related to vision correction systems. In one embodiment, the invention provides systems and methods for verifying a refractive surgical procedure, ideally by ablating a customized corrective lens before imposing a corresponding refractive correction in the corneal tissues.
Known laser eye procedures generally employ an ultraviolet or infrared laser to remove a microscopic layer of stromal tissue from the cornea of the eye to alter the refractive characteristics of the eye. The laser removes a selected shape of the corneal tissue, often to correct refractive errors of the eye. Ultraviolet laser ablation results in photodecomposition of the corneal tissue, but generally does not cause significant thermal damage to adjacent and underlying tissues of the eye. The irradiated molecules are broken into smaller volatile fragments photochemically, directly breaking the intermolecular bonds.
FIG. 1 is an overview of a laser ablation system.
FIG. 2 is a flow chart schematically illustrating an exemplary ablation verification and optical error correction method.
FIG. 3 schematically illustrates wavefront measurements of the eye with a wavefront sensor.
The present invention is particularly useful for enhancing the accuracy and efficacy of laser eye surgical procedures such as photorefractive keratectomy (PRK), phototherapeutic keratectomy (PTK), laser in situ keratomileusis (LASIK), and the like. Preferably, the present invention can provide verification of the improvement of the optical system in the eye and provide feedback to surgeons before the vision correction procedures. Hence, although the system is described in the context of a laser eye surgery system, it should be understood the system may be adapted for use in alternative eye treatment procedures and systems such as for use in radial keratotomy, intraocular lenses, corneal ring implants, and the like. All references referred to in this application are hereby incorporated herein by reference.
The system of the present invention can be easily adapted for use with existing laser systems. By providing verification of actual improvements of the optical system in the eye, the present invention also allows the surgeon to evaluate the procedure plan, and whether additional measurements or an alternative plan should be prepared. Thus, the feedback provided by the present invention may facilitate sculpting of the cornea so that the eye exceeds the normal 20/20 threshold of desired vision.
Referring now to FIG. 1, a laser eye surgery system 10 of the present invention includes a laser 12 that produces a laser beam 14. Laser 12 is optically coupled to laser delivery optics 16, which directs laser beam 14 to an eye of patient P. A delivery optics support structure (not shown here for clarity) extends from a frame 18 supporting laser 12. A microscope 20 is mounted on the delivery optics support structure, the microscope often being used to image a cornea of eye E.