Closed-loop laser eye surgery treatment
A laser eye surgery system includes a laser to generate a laser beam. A topography measurement system measures corneal topography. A processor is coupled to the laser and the topography measurement system, the processor embodying instructions to measure a first corneal topography of the eye. A first curvature of the cornea is determined. A target curvature of the cornea that treats the eye is determined. A first set of incisions and a set of partial incisions in the cornea smaller than the first set of incisions are determined. The set of partial incisions is incised on the cornea by the laser beam. A second corneal topography is measured. A second curvature of the cornea is determined. The second curvature is determined to differ from the target curvature and a second set of incisions are determined. The second set of incisions is incised on the cornea.
1. A method of treating an eye, comprising:
measuring a first corneal topography of the eye;
determining a first curvature of the cornea based on the first corneal topography, and determining a target curvature of the cornea that treats the eye;
determining a first set of incisions in the cornea to achieve the target curvature of the cornea;
determining a first set of first partial incisions in the cornea, wherein the first partial incisions are smaller than the incisions of the first set of incisions;
performing the first set of first partial incisions on the cornea by a laser;
measuring a second corneal topography after performing the first set of first partial incisions;
determining a second curvature of the cornea based on the second corneal topography;
determining whether the second curvature differs from the target curvature by more than a threshold which indicates that the second curvature matches the target curvature;
when it is determined that the second curvature and the target curvature do not differ by more than the threshold, then ending treatment of the eye; and
when it is determined that the second curvature and the target curvature differ by more than the threshold, then:
determining a second set of incisions in the cornea different from the first set of incisions to achieve the target curvature in the cornea;
determining a second set of second partial incisions in the cornea, wherein the second incisions of the second set of partial incisions are smaller than the incisions of the second set of incisions; and
performing the second set of second partial incisions on the cornea by the laser.
2. The method of claim 1 , further comprising:
measuring a third corneal topography after performing the second set of second partial incisions;
determining a third curvature of the cornea on the basis of the third corneal topography;
determining whether the third curvature differs from the target curvature by more than the threshold;
when it is determined that the third curvature and the target curvature do not differ by more than the threshold, then ending treatment of the eye; and
when it is determined that the third curvature and the target curvature differ by more than the threshold, then:
determining a third set of incisions to achieve the target curvature in the cornea;
determining a third set of third partial incisions in the cornea, wherein the third partial incisions of the third set of partial incisions are smaller than the incisions of the third set of incisions; and
performing the third set of third partial incisions on the cornea.
3. The method of claim 2 , wherein the first partial incisions are one half a size of the incisions of the first set of incisions.
4. The method of claim 3 , wherein the second partial incisions are one half a size of the incisions of the second set of incisions.
5. The method of claim 1 , wherein the first set of incisions and the second set of incisions are based on a nomogram.
6. The method of claim 5 , further comprising:
determining the first set of first partial incisions based on a predetermined uncertainty level of the nomogram.
7. The method of claim 1 , wherein the second set of second partial incisions overlaps the first set of first partial incisions so as to deepen the first set of first partial incisions.
8. The method of claim 1 , wherein the corneal topography measurement uses optical coherence tomography imaging.
9. The method of claim 1 , wherein the second corneal topography measures a volume of bubbles formed as a result of the first set of first partial incisions.
10. The method of claim 1 , wherein the laser is a femtosecond laser.
11. The method of claim 1 , wherein the method treats higher order aberrations of the eye.
12. The method of claim 1 , wherein the first partial incisions are one half a size of the incisions of the first set of incisions.