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 a laser-assisted posterior capsulotomy on a lens posterior capsule of an eye, the method comprising:
injecting a fluid between a replacement lens, which has been inserted at least partially into a lens capsule of the eye prior to the injecting of the fluid, and the lens posterior capsule to separate the lens posterior capsule and the replacement lens; and
thereafter, while the replacement lens is disposed at least partially in the lens capsule and the lens posterior capsule is separated from the replacement lens, performing the posterior capsulotomy on the lens posterior capsule by using a laser to incise the lens posterior capsule.
2. The method of claim 1 , wherein the fluid is an ophthalmic viscosurgical device (OVD).
3. The method of claim 1 , further comprising injecting fluid between the lens posterior capsule and an anterior hyaloid membrane of the eye to separate the lens posterior capsule and the anterior hyaloid membrane.
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, which is a size of the incision in a depth direction of the eye, between 400 μm to 800 μm.
6. The method of claim 1 , wherein the posterior capsulotomy is performed using a pulse energy between 7 μJ to 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 , wherein performing the posterior capsulotomy includes compensating for the presence of the replacement lens by using an index of refraction for the replacement lens to determine control parameters used to scan the laser to incise the lens posterior capsule.
9. The method of claim 1 , further comprising, before the step of injecting the fluid:
performing an anterior capsulotomy on the lens capsule by using a laser to incise the lens capsule;
removing at least a portion of the lens nucleus; and
installing the replacement lens so that the replacement lens is at least partially constrained by the lens capsule having the anterior capsulotomy.