Methods and systems for performing a posterior capsulotomy and for laser eye surgery with a penetrated cornea
Method and apparatus for performing a laser-assisted posterior capsulotomy and for performing laser eye surgery on an eye having a penetrated cornea are provided. A method for performing a posterior capsulotomy includes injecting fluid between the lens posterior capsule and the anterior hyaloids membrane to separate the lens posterior capsule and the anterior hyaloids membrane. With the lens posterior capsule separated from the anterior hyaloids membrane, a posterior capsulotomy is performed on the lens posterior capsule by using a laser to incise the lens posterior capsule.
1. A method for performing laser-assisted cataract surgery on an eye having a lens posterior capsule and an anterior hyaloid membrane, the method comprising:
guiding a self-bent needle in a direction parallel to a lower surface of the lens posterior capsule to a space between the lens posterior capsule and the anterior hyaloid membrane;
injecting a fluid through the needle into the space between the lens posterior capsule and the anterior hyaloid membrane to separate the lens posterior capsule and the anterior hyaloid membrane;
after injecting the fluid, intra-operatively imaging at least a portion of the lens posterior capsule, thereby obtaining image data of a spatial disposition of an inverted lens posterior capsule; and
with the lens posterior capsule separated from the anterior hyaloid membrane, performing a posterior capsulotomy on the lens posterior capsule by using a laser to incise the lens posterior capsule based at least in part on the image data.
2. The method of claim 1 , wherein the fluid is injected into the Berger's space.
3. The method of claim 1 , wherein the fluid is an ophthalmic viscosurgical device (OVD).
4. The method of claim 1 , wherein the posterior capsulotomy leaves the anterior hyaloid membrane completely intact.
5. The method of claim 1 , wherein the posterior capsulotomy is performed using an incision depth between 400 μm and 800 μm, the incision depth being an extent of the incision in a depth direction of the eye.
6. The method of claim 1 , wherein the posterior capsulotomy is performed using a pulse energy between 7 μJ and 10 μJ.
7. The method of claim 1 , wherein the posterior capsulotomy is performed using a capsulotomy diameter of at least 3.5 mm.
8. The method of claim 1 , further comprising installing a replacement lens so that the replacement lens is at least partially constrained by the lens capsule.
9. The method of claim 8 , wherein the replacement lens is installed using a posterior optic buttonholing technique.
10. The method of claim 8 , wherein the replacement lens is installed using a bag-in-lens technique.
11. The method of claim 1 , further comprising: performing an anterior capsulotomy on the lens capsule by using the laser to incise the lens capsule; and removing at least a portion of the lens nucleus.