Method and Apparatus for Multi-Step Correction of Ophthalmic Refractive Errors
First Claim
Patent Images
1. A method for photoablatively treating an eye having a refractive error, comprising the steps of:
- determining the refractive error of the eye;
determining an initial treatment plan that partially corrects the refractive error;
performing the initial treatment plan;
determining a residual refractive error of the eye;
determining a follow-up treatment plan that substantially corrects the residual refractive error; and
performing the follow-up treatment plan.
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Abstract
A technique of refractive eye correction employs multiple steps to correct refractive errors in the eye. In the first step, gross decentrations of the refractive error are corrected, allowing the subsequent steps to be relatively symmetric in their treatment profile. Then, the eye'"'"'s refractive error is again measured, and a subsequent treatment is applied for the remaining error. The overall treatment is thus completed in two or more steps.
53 Citations
34 Claims
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1. A method for photoablatively treating an eye having a refractive error, comprising the steps of:
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determining the refractive error of the eye; determining an initial treatment plan that partially corrects the refractive error; performing the initial treatment plan; determining a residual refractive error of the eye; determining a follow-up treatment plan that substantially corrects the residual refractive error; and performing the follow-up treatment plan. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17)
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12. The method of claim l wherein at least one of the steps of determining further comprises the step of making a topographic-based measurement of the eye.
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18. A method for determining a multi-stage photoablative treatment plan for an eye having a refractive error, comprising the steps of
determining an overall refractive treatment profile of the eye to substantially correct an asymmetric refractive error and a symmetric refractive error of the eye; -
determining a largest symmetric profile of corneal tissue removal consistent with the overall refractive treatment profile; subtracting-out the largest symmetric profile from the overall profile so as to yield an initial treatment profile suitable to correct the asymmetric refractive error; determining a first stage treatment plan for obtaining the initial treatment profile; determining a follow-up refractive treatment profile suitable to correct a residual refractive error; and determining a second-stage stage treatment plan for obtaining the follow-up refractive treatment profile. - View Dependent Claims (19, 21, 25)
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20. The method of claim l 8, comprising using a topographic-based measurement to determine the overall refractive treatment profile and the largest symmetric profile, and using a wavefront-based measurement to determine the follow-up refractive treatment profile.
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22. A method for determining a multi-stage photoablative treatment plan for an eye having a refractive error, comprising the steps of:
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determining an overall refractive treatment profile of the eye to substantially correct an asymmetric refractive error and a symmetric refractive error of the eye; determining a symmetric profile of corneal tissue removal that is less than a maximum symmetric profile of tissue removal consistent with the overall refractive treatment profile; subtracting-out the symmetric profile from the overall profile so as to yield an initial treatment profile suitable to correct the asymmetric refractive error; determining a first stage treatment plan for obtaining the initial treatment profile; determining a follow-up refractive treatment profile suitable to correct a residual refractive error; and determining a second-stage stage treatment plan for obtaining the follow-up refractive treatment profile. - View Dependent Claims (23, 24)
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26. A method for photoablatively treating an eye having a refractive error, comprising the steps of:
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obtaining a topographic-based refractive diagnostic measurement of the eye; performing a first-stage treatment based upon the topographic-based refractive diagnostic measurement including treating a gross asymmetric refractive error of the eye so as to yield a residual, generally symmetric refractive error; obtaining a wavefront-based refractive diagnostic measurement of the eye after performing the first-stage treatment; and performing a second-stage treatment including treating the residual, generally symmetric error.
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27. A system for determining a photoablative refractive treatment of an eye having a refractive error, comprising:
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a computer system adapted to receive refractive diagnostic eye data indicative of an asymmetric refractive error of the eye and a symmetric refractive error of the eye; and computer software that, when executed by the computer system, calculates an initial treatment plan that is based upon the refractive diagnostic eye data, and which provides an initial treatment profile that is a corrective profile for the asymmetric refractive error, wherein a residual refractive error is substantially the symmetric refractive error. - View Dependent Claims (28, 29, 30, 31, 32)
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33. A multi-stage photoablative treatment plan for an eye having a refractive error, comprising:
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an initial diagnostic measurement that provides an overall refractive error measurement of the eye having an asymmetric refractive error and a symmetric refractive error; a first stage treatment plan derived from the initial diagnostic measurement that provides an initial treatment profile suitable to correct the asymmetric refractive error of the eye, a follow-up diagnostic measurement that provides a measurement of a residual symmetric refractive error of the eye; a second-stage treatment plan derived from the follow-up diagnostic measurement that provides a follow-up treatment profile suitable to correct the residual symmetric refractive error of the eye. - View Dependent Claims (34)
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Specification