Laser system and method for correction of induced astigmatism
There is provided a system, apparatus and methods for developing laser systems that can create precise predetermined clear corneal incisions that are capable of reducing induced astigmatism. The systems, apparatus and methods further provide laser systems that can provide these incisions at or below Bowman's membrane.
1. A system for providing laser shot patterns to an eye, for the correction of induced astigmatic aberrations of the eye, the system comprising:
a therapeutic laser for producing a laser beam;
optics for receiving the laser beam and directing the laser beam to an eye so that: 1) a laser shot pattern for performing an ophthalmic surgical procedure is generated, 2) a laser shot pattern for sectioning a lens of an eye is generated, wherein one or more of the laser shot pattern for performing the ophthalmic surgical procedure and the laser shot pattern for sectioning a lens of an eye causes induced astigmatism to the eye; and 3) a laser shot pattern for providing a sub-Bowman's membrane arcuate cut in a cornea of the eye, wherein the laser system provides the sub-Bowman's membrane arcuate cut in a manner that does not disrupt either Bowman's membrane of the eye or an epithelium of the eye and reduces the induced astigmatism of the eye.
2. The system of claim 1 , wherein the sub-Bowman's membrane arcuate pattern is oriented along a steep axis so as to be intersected by the steep axis.
3. The system of claim 1 , wherein the sub-Bowman's membrane arcuate pattern has about a 3 mm radius.
4. The system of claim 1 , wherein the sub-Bowman's membrane arcuate pattern has an arc of about 60°.
5. The system of claim 1 , wherein the sub-Bowman's membrane arcuate pattern has an arc of about 90°.
6. The system of claim 1 , wherein the sub-Bowman's membrane arcuate pattern has an arc of about less than 90° and about greater than or equal to 60°.
7. The system of claim 1 , wherein the sub-Bowman's membrane arcuate pattern has about a 3 mm radius and an arc of about 90° to about 60°.
8. The system of claim 1 , wherein the laser system provides the sub-Bowman's membrane arcuate cut in a manner that does not disrupt the Bowman's membrane of the eye.
9. The system of claim 1 , wherein the laser system provides the sub-Bowman's membrane arcuate cut in a manner that does not disrupt the epithelium of the eye.
10. The system of claim 1 , wherein the laser system provides the sub-Bowman's membrane arcuate cut in a manner that does not disrupt both the Bowman's membrane of the eye and the epithelium of the eye.
11. A method for performing surgery and reducing induced astigmatism by using a laser system comprising:
positioning an eye of a patient with respect to a laser system;
directing the laser system to perform an ophthalmic surgery on the positioned eye;
directing the laser system to deliver a pair of arcuate laser shot patterns to a cornea of the eye, wherein each of the pair of arcuate laser shot patterns is oriented along a steep axis so as to be intersected by the steep axis, thereby reducing the induced astigmatism of the eye while not disrupting a Bowman's membrane of an eye or an epithelium of the eye.
12. The method of claim 11 , wherein each of the pair of arcuate laser shot patterns has about a 3 mm radius.
13. The method of claim 11 , wherein the arcuate laser shot pattern has an arc of about 60°.
14. The method of claim 11 , wherein the arcuate laser shot pattern has an arc of about 90°.
15. The method of claim 11 , wherein the arcuate laser shot pattern has an arc of about less than 90° and about greater than or equal to 60°.
16. The method of claim 11 , wherein the arcuate laser shot pattern has about a 3 mm radius and an arc of about 90° to about 60°.
17. The method of claim 11 , wherein the arcuate laser shot pattern has a depth of about less than or equal to a thickness of the cornea of the eye.
18. The method of claim 11 , wherein each of the pair of arcuate laser shot patterns do not disrupt the Bowman's membrane of the eye.
19. The method of claim 11 , wherein each of the pair of arcuate laser shot patterns do not disrupt the epithelium of the eye.
20. The method of claim 11 , wherein each of the pair of arcuate laser shot patterns do not disrupt both the Bowman's membrane of the eye and the epithelium of the eye.