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Yag Laser

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Lens Replacement

Today, nearly everyone having modern cataract surgery will have a lens implant placed inside their eye at the time of surgery. These plastic implants, or artificial lenses, permit rapid return of vision and avoid the frustrations associated with contact lenses and thick aphakic glasses with strong magnifications.
For removing an eye lens, surgeon makes a small incision in the front wall or capsule of the lens and emulsifies the internal contents of the lens. However, the back wall or capsule of the lens is left intact, and the plastic artificial lens is placed inside the capsule, sometimes termed by the operating surgeon "in-the-bag." Over the next few months or year or two, a cloudy film or membrane may form, much like a sheet of wax paper, across the capsule behind the artificial lens implant. This cloudy film is termed a "secondary membrane" or an "after cataract."
In past years, such membranes needed to be cut with a very tiny surgical knife. To ensure safety and sterility, the procedure usually required another visit to the operating room. This opening is necessary only for those cataract surgery patients whose secondary membrane becomes sufficiently cloudy to impair a clear vision.
In recent years, however, a laser technique has been developed to cut open this secondary membrane in doctor's office. The laser is commonly called "Nd: YAG laser" or simply "YAG laser. Its real name is "Neodymium-Yttrium Aluminum-Garnet laser". The YAG laser can cut the opaque membranes by creating a series of tiny explosions in a line or cross pattern. This procedure is called posterior capsulotomy. Thus, if you experience impaired vision after cataract surgery, the YAG laser may promptly restore your vision without a risk of bleeding or infection inside the eye.
Some people believe that the cataract surgery is done by laser. It is not true. In USA, cataracts are currently removed surgically by phacoemulsification method, which is an ultrasound technology. The YAG laser is used only to treat "after cataracts but not to remove the cataracts.