Method and systems for laser treatment of presbyopia using offset imaging
First Claim
1. A method of treating a cornea of an eye of a patient to mitigate presbyopia, the eye having a pupil and a cornea, the method comprising:
- identifying a multifocal ablation shape having a first region providing a near vision correction and a second region providing a far vision correction;
adjusting an ablation cut profile of the multi focal ablation shape in response to the size of the pupil so as to provide a balance of the near vision correction provided by the first region and the far vision correction provided by the second region for the patient;
ablating the eye with a series of laser beam pulses according to the adjusted ablation cut profile.
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Accused Products
Abstract
An ophthalmic surgery system and method for treating presbyopia by performing ablative photodecomposition of the corneal surface. The offset image of a variable aperture, such as a variable width slit and variable diameter iris diaphragm, is scanned in a preselected pattern to perform ablative sculpting of predetermined portions of a corneal surface. The scanning is performed to ablate an optical zone sized to match the patient pupil with a peripheral transition zone outside the pupil. The shape of the ablated optical zone is different from the shape of the final optical correction on the anterior surface of the cornea. The optical zone corrects for near-vision centrally and far-vision peripherally. A movable image displacement mechanism enables radial displacement and angular rotation of the profiled beam exiting from the variable aperture. The invention enables wide area treatment with a laser having a narrower beam than the treatment area, and can be used in the treatment of many conditions in conjunction with presbyopia such as hyperopia, hyperopic astigmatism and irregular refractive aberrations.
68 Citations
15 Claims
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1. A method of treating a cornea of an eye of a patient to mitigate presbyopia, the eye having a pupil and a cornea, the method comprising:
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identifying a multifocal ablation shape having a first region providing a near vision correction and a second region providing a far vision correction;
adjusting an ablation cut profile of the multi focal ablation shape in response to the size of the pupil so as to provide a balance of the near vision correction provided by the first region and the far vision correction provided by the second region for the patient;
ablating the eye with a series of laser beam pulses according to the adjusted ablation cut profile. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for treating a cornea of an eye of a patient to mitigate presbyopia with a multifocal ablation shape, the eye having a pupil and a cornea, the system comprising:
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a laser for making a beam of an ablative light energy;
a processor in electrical communication with the laser and controlling a distribution of a series of laser beam pulses to ablate the multifocal shape on the eye, the multifocal ablation shape producing a first region of the cornea providing a near vision correction and a second region of the cornea providing a far vision correction, the processor determining the distribution of laser beam pulses in response to a signal related to a size of the pupil so as to balance the near vision correction and the far vision correction of the multifocal treatment for the patient. - View Dependent Claims (11, 12, 13, 14, 15)
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Specification