Laser capsulovitreotomy
Methods and systems for performing laser-assisted surgery on an eye form a layer of bubbles in the Berger's space of the eye to increase separation between the posterior portion of the lens capsule of the eye and the anterior hyaloid surface of the eye. A laser is used to form the layer of bubbles in the Berger's space. The increased separation between the posterior portion of the lens capsule and the anterior hyaloid surface can be used to facilitate subsequent incision of the posterior portion of the lens capsule with decreased risk of compromising the anterior hyaloid surface. For example, the layer of bubbles can be formed prior to performing a capsulotomy on the posterior portion of the lens capsule.
1. A system for performing laser-assisted posterior capsulotomy that minimizes a risk of anterior hyaloid rupture to an eye having a lens capsule with a posterior surface, an anterior hyaloid surface, and a Berger's space between the posterior surface of the lens capsule and the anterior hyaloid surface, the system comprising:
a laser source configured to produce a treatment beam comprising a plurality of laser pulses having a wavelength of 500 to 1100 nm, a pulse duration of 10 fs to 30 ns, a repetition rate of 10 Hz to 1 MHz, and an energy of 1 to 20 μJ;
an integrated optical system comprising an imaging assembly operatively coupled to a treatment laser delivery assembly, wherein the imaging assembly and the treatment laser delivery assembly share at least one common optical element, the integrated optical system being configured to image target tissue structures including the posterior surface of the lens capsule and the anterior hyaloid surface and direct a focal spot of the treatment beam in three-dimensional patterns, wherein the focal spot has a diameter of 1 to 20 microns; and
a controller operatively coupled with the laser source and the integrated optical system, the controller including a processor and a computer usable non-transitory medium having a computer readable program code embedded therein, the computer readable program code configured to cause the controller to identify the posterior surface of the lens capsule and the anterior hyaloid surface, and control the laser source and the integrated optical system cooperatively in sequence to:
direct the focal spot of the treatment beam within the Berger's space to form a layer pattern consisting of a plurality of bubbles which extend laterally within the Berger's space in directions transverse to an optical axis of the eye to increase a separation between the posterior surface of the lens capsule and the anterior hyaloid surface;
direct the focal spot of the treatment beam to the posterior surface of the capsule to incise the posterior surface of the lens capsule.
2. The system of claim 1 , wherein the the computer readable program code is further configured to cause the controller to control the laser source and the optical system to irradiate the laser beam into a focal point aligned with the Berger's space by using an operating numerical aperture of between 0.005 and 0.5.