Methods and systems for treating presbyopia
AssigneeAMO Development, LLC
InventorZsolt Bor
Life of this patent
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Abstract
Methods and systems for treating presbyopia are provided. In accordance with an embodiment, by way of example only, a method of treating presbyopia of an eye includes ablating the stroma to form a final ablated shape in the stroma, the final ablated shape including a central zone defined by a concavity having a central zone depth and a central zone diameter, the central zone depth and the central zone diameter each selected to provide the cornea with a near-vision add power after the epithelium is regenerated over the stroma.
Claims19
A method of treating presbyopia of an eye, the method comprising:
- determining a presbyopia-correcting refractive power for the eye by determining an ametropic-correcting prescription for the eye;
- and
- ablating a stroma of a cornea of the eye to form a final ablated shape in the stroma, the final ablated shape including a central zone defined by a concavity having a central zone depth (d), a central zone diameter (D), and a radius of curvature (R) in a range of about 3 mm to about 20 mm, the central zone depth and the central zone diameter each selected to provide a near-vision add power between 1.0 Diopters and 3.5 Diopters after the epithelium is regenerated over the stroma;
- wherein
- d=D2÷8R,
- D=Φ√{square root over (%)}, where % is an optimal percentage of light passing through a near vision zone of the cornea and (1) is an average photopic pupil diameter of a patient who is 45 years or older, the optimal percentage being between about 20% and about 60% and
- R=Δn÷ΔP where ΔP is a desired near vision add power and Δn is a difference in refractive index between the epithelium and the stroma.
A system for treating presbyopia of an eye having an epithelium, a cornea, and a stroma, the system comprising:
- a laser configured to provide a laser beam along an optical path;
- a support for positioning an eye for presbyopic treatment in the optical path of the laser beam;
- a processor in operable communication with the laser;
- and
- a computer readable medium including instructions that, when executed, cause the processor to (1) determine a laser target surface on the eye and (2) provide commands to the laser to ablate a surface of the stroma to form a final ablated shape in the stroma, wherein the final ablated shape includes a central zone defined by a concavity having a central zone depth (d), a central zone diameter (D), and a radius of curvature (R) in a range of about 3 mm to about 20 mm, and the central zone depth and the central zone diameter in combination provide the cornea with a near-vision add power between 1.0 Diopters and 3.5 Diopters after the epithelium is regenerated over the stroma;
- wherein
- d=D2÷8R,
- D=φ√{square root over (%)}, where % is an optimal percentage of light passing through a near vision zone of the cornea and φ is an average photopic pupil diameter of a patient who is 45 years or older, the optimal percentage being between about 20% and about 60%, and
- R=Δn÷ΔP, where ΔP is a desired near vision add power and Δn is a difference in refractive index between the epithelium and the stroma.
Dependencies are inferred from the claim text.