Type of Surgery
Information
Last updated: 02/17/2009
Usually, retinal cryopexy is administered under local anesthesia. The procedure involves placing a metal probe against the eye. When a foot pedal is depressed, the tip of the cryopexy probe becomes very cold as a result of the rapid expansion of very...
cold gases (usually nitrous oxide) within the probe tip. When the probe is placed on the eye the formation of water crystals followed by rapid thawing results in tissue destruction. This is followed by healing and scar tissue formation.
In the case of retinal detachment, treatment calls for irritating the tissue around each of the retinal tears. Cryopexy stimulates scar formation, sealing the edges of the tear. This is typically done by looking into the eye using the indirect ophthalmoscope while pushing gently on the outside of the eye using the cryopexy probe, producing a small area of freezing that involves the retina and the tissues immediately underneath it. Using multiple small freezes like this, each of the tears is surrounded. Irritated tissue forms a scar, which brings the retina back into contact with the tissue underneath it.
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Other Information
Definition
Retinal cryopexy, also called retinal cryotherapy, is a procedure that uses intense cold to induce a chorioretinal scar and to destroy retinal or choroidal tissue.
Purpose
The retina is the very thin membrane in the back of the eye that acts like the "film" in a camera. It is held against the inside back portion of the eye by pressure from fluid within the eye. In the front part of the eye, the retina is firmly attached at a ring just behind the lens called the pars plana. In the back part of the eye, the retina is continuous with the optic nerve. In between the pars plana and the optic nerve the retina has no fixed attachments. The retina collects information from the images projected on it from the eye lens and sends it along the optic nerve to the brain, where the information is interpreted and experienced as sight.
Other Information
Approximately 56% of all patients achieve results of 20/20 or better and over 90% achieve 20/40 or better (which is good enough to drive without corrective lenses in most regions).1 Those with moderate to high myopia (greater than 7 diopters) have a lesser chance of achieving that result. As technique and technology improve, the results continue to improve.
From: Eye Surgery Education Council
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