METHOD OF PERFORMING REFRACTIVE LASER EYE SURGERY CENTERED ALONG THE VISUAL AXIS OF A HUMAN EYE
First Claim
1. A method of creating a pattern to be followed by a laser over a new coordinate center comprising the steps of:
- measuring an original wavefront centered on a center of a pupil;
quantifying the original wavefront in terms of aberration polynomials, each aberration polynomial being weighted by an aberration coefficient;
determining a shift from the center of the pupil to the new coordinate center;
transforming the aberration coefficients based on the shift, wherein the transformed aberration coefficients define a reconstructed wavefront; and
creating the pattern for the laser from the reconstructed wavefront, wherein the pattern is centered over the new coordinate center.
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Abstract
A method of performing refractive laser eye surgery on a human eye is provided wherein the ablation pattern is centered along the visual axis, rather than along the line of sight. First, a wavefront, either ocular, corneal or a combination thereof, is generated by a wavefront sensor centered along the line of sight. This measured wavefront is centered on and encompasses a patient'"'"'s pupil. Then, an analysis pupil is determined which encompasses the measured pupil. The analysis pupil is centered along the visual axis at the point of intersection with the cornea. Consequently, the measured wavefront is reconstructed over the analysis pupil only using data taken over the area covered by the measured pupil. This reconstruction is done through a least squares fit of a series of slopes from the measured wavefront and/or through the transformation of aberration coefficients. Finally, an ablation pattern, or a lenticule generation pattern, to be performed by a refractive laser centered on the corneal intersect of the visual axis is produced in accordance with the reconstructed wavefront.
20 Citations
20 Claims
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1. A method of creating a pattern to be followed by a laser over a new coordinate center comprising the steps of:
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measuring an original wavefront centered on a center of a pupil; quantifying the original wavefront in terms of aberration polynomials, each aberration polynomial being weighted by an aberration coefficient; determining a shift from the center of the pupil to the new coordinate center; transforming the aberration coefficients based on the shift, wherein the transformed aberration coefficients define a reconstructed wavefront; and creating the pattern for the laser from the reconstructed wavefront, wherein the pattern is centered over the new coordinate center. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of performing refractive laser eye surgery on a human eye comprising the steps of:
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measuring an original wavefront centered on a center of a measurement pupil; determining an analysis pupil encompassing the measurement pupil, wherein the analysis pupil is centered on a new coordinate center; generating surface data from the original wavefront for the areas covered by the measurement pupil; performing a least squares wavefront reconstruction fit over the analysis pupil using the surface data so as to provide a reconstructed wavefront; and creating a pattern to be followed by a laser from the reconstructed wavefront, wherein the pattern is centered on the new coordinate center - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of generating a laser pattern centered on a new coordinate center comprising the steps of:
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generating primary and secondary raw data from an aberrometer operating over a pupil along a line of sight, wherein the line of sight is defined between the center of a fixation target and a center of the pupil; generating a reconstructed wavefront from the primary and secondary raw data based on a shift from the line of sight to the new coordinate center; and creating the laser pattern using the reconstructed wavefront, wherein the laser pattern is centered on the new coordinate center.
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Specification