You are remarkably well informed. In those patients in whom trabeculectomy has not worked or will not work, the use of glaucoma valves has shown great promise. Earlier they were being used only in failed glaucoma operated cases, but now they are also being used as a primary procedure in select cases. As their name suggests, these are artificial, usually plastic (PMMA) devices which have a tube placed in the anterior chamber and a valve at the end of the tube. This allows drainage of fluid from the eye when the pressure is raised and blocks the drainage when pressure is normal or low, thus preventing too low an eye pressure.
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