Enhanced wavefront ablation system

• US 6,685,319 B2
• Filed: 09/20/2001
• Issued: 02/03/2004
• Est. Priority Date: 09/21/2000
• Status: Expired due to Term

• Current Assignee: Amo Manufacturing Usa, Llc (Johnson & Johnson)
• Original Assignee: VISX Incorporated
• Inventors: Shimmick, John K., Watson, Jason
• Primary Examiner(s): Ruhl, Dennis
• Assistant Examiner(s): SANDERS JR, JOHN R
• Application Number:
  US09/960,163
• Publication Number:
  US 20020097375A1
• Time in Patent Office: 866 Days
• Field of Search: 351/205, 351/212, 351/216, 351/219, 351/221, 351/222, 351/227, 351/230, 351/233, 351/239, 351/246, 351/247, 600/558, 606/5, 606/107, 607/89, 128/898
• US Class Current: 351/219
• CPC Class Codes: A61B 3/04 Trial frames; Sets of lenses for use therewith lenses per se G02C7/02
• CPC Class Codes: A61B 3/112 for measuring diameter of pupils
• CPC Class Codes: A61F 2009/00844 Feedback systems
• CPC Class Codes: A61F 2009/00872 Cornea
• CPC Class Codes: A61F 2009/0088 based on wavefront
• CPC Class Codes: A61F 9/00806 Correction of higher orders

Abstract

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.

Claims

1. A method comprising:

measuring an actual optical error of an eye;

generating a plan for a corrective procedure of the eye from the measured optical error; and

forming a verification lens based on the measured optical error to verify the procedure plan; and

measuring a visual acuity of the eye as better than 20/20 with the verification lens while exposing an ablated surface of the verification lens.

2. The method of claim 1, further comprising measuring irregular optical error of the eye, wherein the verification lens compensates for the irregular error.

3. The method of claim 2, further comprising measuring a wavefront of light passing through the optical components of the eye with a wavefront sensor to measure a refractive error of the eye.

4. The method of claim 3, wherein the verification lens is generated by ablating a lens material according to an ablation pattern, and further comprising calculating the ablation pattern for the verification lens from the measured optical error of the eye, and from at least one member selected from the group consisting of a refractive index of the lens material, a rate of ablation of the lens material, and a shape of ablation of the lens material.

5. The method of claim 4, further comprising ablating a corneal tissue of the eye according to an ablation pattern, and further comprising calculating the ablation pattern for the corneal tissue from the measured optical error of the eye, and from at least one member selected from the group consisting of a refractive index of the corneal tissue, a rate of ablation of the corneal tissue, and a shape of ablation of the corneal tissue material.

6. A method comprising:

measuring an actual optical error of an eye of a patient with a wavefront sensor;

generating an ablation pattern from the measured optical error, and generating an ablation pattern for a lens material corresponding to the ablation pattern for the eye;

positioning the lens material relative to an ablation system by aligning indicia of the lens material with a reference structure of the ablation system;

ablating a verification lens in the aligned lens material with the ablation system;

aligning an aperture with the verification lens;

mounting the verification lens and the aperture to the patient so that the eye is aligned with the verification lens;

reading an eye chart with the eye through the verification lens and the aperture while exposing an ablated surface of the verification lens to determine whether a corrected visual acuity of the eye is better than 20/20 so as to verify the ablation pattern of the eye.

7. A system for correcting an optical error of an eye, the system comprising:

a sensor for measuring the optical error of the eye;

a processor for generating a verification pattern of laser energy corresponding to a refractive procedure plan of the eye, the procedure plan intended to correct the measured optical error;

a lens material;

a laser system for directing laser energy onto the lens material according to the verification pattern so as to form a verification lens from the lens material such that optical properties of the eye, as corrected by the verification lens with an exposed ablated surface, can verify the procedure plan with a visual acuity better than 20/20.

8. A system for correcting an actual optical error of an eye, the system comprising:

a sensor for measuring the optical error of the eye;

a processor for generating a pattern of laser energy for ablation of the eye so as to correct the measured optical error, and for generating a verification pattern of laser energy corresponding to the eye ablation pattern;

a lens material having indicia of alignment;

a laser system for directing laser energy onto the lens material according to the verification pattern so as to form a verification lens from the lens material, the laser system having a reference structure corresponding with the indicia of alignment so as to ensure registration of the verification pattern on the lens material, the verification lens providing a visual acuity for the eye better than 20/20 while an ablated surface of the verification lens is exposed;

aperture means for alignment of an aperture with the verification lens, the aperture means having an aperture size selected in response to a size of a pupil of the eye; and

mounting means for supporting the verification lens and aperture in alignment with the patient while a head of the patient moves to read an eye chart.

9. A method for selecting an eye of a patient for refractive surgery, the method comprising:

measuring an actual optical error of the eye of the patient with a wavefront sensor;

generating a first ablation pattern from the measured optical error, and generating a second ablation pattern for a lens material, the second ablation pattern corresponding to the first ablation pattern for the eye;

ablating a verification lens with the ablation system;

aligning the second ablation pattern with the eye by rotating the head of the patient with the verification lens fixed to the head; and

measuring the visual acuity of the eye to be better than 20/20 with the verification lens by reading an eye chart while exposing an ablated surface of the verification lens.

10. The method of claim 9, when the aligning step comprises autoaligning the second ablation pattern with the eye.

11. A system for verifying a specific refractive error of a patient, the system comprising:

a verification lens having optical properties compensating for the specific refractive error of the patient, the verification lens providing a visual acuity for the eye better than 20/20 while an ablated surface of the verification lens is exposed;

an aperture aligned with the verification lens; and

a trial frame supporting the verification lens and aperture.