Methods and systems to provide excluded defined zones for increasing accommodative amplitude
Systems and methods for increasing the amplitude of accommodation of an eye, changing the refractive power of lens material of a natural crystalline lens of the eye, and addressing presbyopia are is provided. Generally, there are provided methods and systems for delivering a laser beam to a lens of an eye in a plurality of laser shots, which are in precise and predetermined patterns results in the weakening of the lens material.
1. A system for increasing the accommodative amplitude of an eye, the system comprising:
a. a laser for providing a laser beam;
b. an optical path for delivery of the laser beam from the laser to a natural crystal lens of an eye;
c. optics located along the optical path, the optics providing the capability to control the laser beam in the x, y and z directions;
d. a control system comprising a laser beam delivery pattern, for directing the optics to deliver the laser beam in the laser beam delivery pattern to a predetermined area of the lens of the eye;
e. the laser beam delivery pattern comprising a plurality of laser beam shots, the plurality of laser beam shots defining a first and a second area of the lens, the first area having an outer portion that essentially follows the curvature of the lens, the second area defining an excluded zone;
f. whereby, the delivery of the laser beam in the laser beam pattern to the natural crystalline lens of the eye changes the flexibility and shape of the first area of the lens, thereby increasing the accommodative amplitude of the eye; and,
g. wherein the first area has an inner diameter of 2 mm and an outer diameter of about 6 mm.
2. The system of claim 1 , wherein the delivery of the laser beam in the laser beam pattern to the natural crystalline lens of the eye does not change the flexibility and shape of the second area of the lens.
3. A system for increasing the accommodative amplitude of an eye, the system comprising:
a. a laser for providing a laser beam;
b. an optical path for delivery of the laser beam from the laser to a natural crystal lens of an eye;
c. optics located along the optical path, the optics providing the capability to control the laser beam in the x, y and z directions;
d. a control system comprising a laser beam delivery pattern, for directing the optics to deliver the laser beam in the laser beam delivery pattern to a predetermined area of the lens of the eye;
e. the laser beam delivery pattern comprising a plurality of laser beam shots, the plurality of laser beam shots defining a first and a second area of the lens, the first area having an outer portion that essentially follows the curvature of the lens, the second area defining an excluded zone;
f. whereby, the delivery of the laser beam in the laser beam pattern to the natural crystalline lens of the eye changes the flexibility and shape of the first area of the lens, thereby increasing the accommodative amplitude of the eye; and,
g. wherein the excluded zone comprises an axial excluded zone and an equatorial excluded zone.
4. The system of claim 3 , wherein the axial excluded zone and the equatorial excluded zones intersect.
5. The system of claim 4 , wherein the intersection includes the area defined by the middle of the equatorial axis and the AP axis of the lens.
6. The system of claim 3 , wherein the delivery of the laser beam in the laser beam pattern to the natural crystalline lens of the eye does not change the flexibility and shape of the second area of the lens.
7. A system for increasing the accommodative amplitude of an eye, the system comprising:
a. a laser for providing a laser beam;
b. an optical path for delivery of the laser beam from the laser to a natural crystal lens of an eye;
c. optics located along the optical path, the optics providing the capability to control the laser beam in the x and y directions;
d. a control system comprising a laser beam delivery pattern, for directing the optics to deliver the laser beam in the laser beam delivery pattern to a predetermined area of the lens of the eye;
e. the laser beam delivery pattern comprising a plurality of laser beam shots, the plurality of laser beam shots defining a first and a second area of the lens, the first area having an outer portion that essentially follows the curvature of the lens, the second area defining an excluded zone;
f. comprising a position determination assembly;
g. whereby, the delivery of the laser beam in the laser beam pattern to the natural crystalline lens of the eye changes the flexibility of and weakens the first area of the lens, thereby increasing the accommodative amplitude of the eye.
8. The system of claim 7 , wherein the position determination assembly comprises: a light source to provide an illumination beam; an x, y, scanner; a z-focus device; an image capture device for providing observed data; a processor associated with the image capture device and capable of performing calculations, whereby the image capture device provides the observed data to the processor; the processor associated with a numerical model; and the processor capable of determining a position for a structure of the lens of the eye based upon the numerical model and the observed data.
9. The system of claim 8 , wherein the light source is a coherent light source.
10. The system of claim 8 , wherein the light source is a structured coherent light source.
11. The system of claim 8 , wherein the light source is a structured coherent light source having a short coherence length.
12. The system of claim 8 , wherein the light source is a laser diode.
13. The system of claim 8 , wherein the light source is an infrared laser diode.
14. The system of claim 8 , wherein the light source is a scanned infrared laser diode, whereby the scanned infrared laser diode defines a structured light source.
15. The system of claim 8 , wherein the image capture device comprises a Scheimpflug camera.