Systems and Methods for Laser Correction of Astigmatism Incident with Lens Replacement Surgery
AssigneeLaserarcs, LLC
InventorsBart A. Jones, Michael P. Jones
Life of this patent
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Abstract
A nomogram, a method for determining how to cut a cornea to produce a particular vision correction, and a system and method for determining how to make a vision correction when a precision cutting tool is being used as opposed to the performance of hand cuts. In a further embodiment, measurement of astigmatism to be corrected, calculation of the nomogram, and the actual cutting are mostly or completely automated eliminating human error from the system.
Claims20
A method of cutting the cornea of an eye to correct astigmatism, the method comprising:
- determining an amount of astigmatism of said eye;
- determining an axis of said astigmatism of said eye;
- determining an age of said eye;
- selecting a mirrored cut position in said cornea, said cut position being less than a 10 mm optical zone and greater than a 6 mm optical zone and comprising two cuts on opposing sides of said eye;
- calculating a cut length from said amount, age, and cut position;
- and
- utilizing a precision cutting instrument to cut said cut length at said cut position.
A method of cutting the cornea of an eye to correct astigmatism, the method comprising:
- determining an amount of astigmatism of said eye;
- determining an axis of the astigmatism of said eye;
- determining an age of said eye;
- calculating a cut length from said amount, age, and cut position;
- and
- utilizing a femtosecond laser to cut said cut length at said cut position;
- wherein said axis is at least 20° from horizontal and vertical;
- and
- wherein said cut length is determined by the following formula:
- cut length=60°−(5°*X)+(5°*Y);
- where X is (the patient's age in years minus 30) divided by 20;
- and
- Y is the (the patient's astigmatism in diopters −2) divided by 0.2
A method of cutting the cornea of an eye to correct astigmatism, the method comprising:
- determining an amount of astigmatism of the eye;
- determining an axis of the astigmatism of the eye;
- determining an age of the eye;
- calculating a cut length from said amount, age, and cut position;
- and
- utilizing a femtosecond laser to cut said cut length at said cut position;
- wherein said axis is no more than 20° from vertical;
- and
- wherein said cut length is determined by the following formula:
- cut length=65°−(5°*X)+(5°*Y);
- where X is (the patient's age in years minus 30) divided by 20;
- and
- Y is the (the patient's astigmatism in diopters −2) divided by 0.2.
Dependencies are inferred from the claim text.