The Ex-PRESS mini shunt is a relatively new device, available in the USA since 2002. Over 12,000 implantations have been performed worldwide. It is a straightforward procedure, in which you divert the fluid through an extremely small tube to the outside of the eye. You neither cut sclera, nor iris. Although the device is as small as a grain of rice, it acts just like a heart stent keeping a pathway open so blood (or fluid) can successfully go around the blockage. The Ex-PRESS provides precise control of the amount of fluid that is allowed to flow out, helping the eye maintain a healthy level of internal pressure.
The Ex-PRESS mini glaucoma shunt provides effective long term control of intraocular pressure, with a success rate of about 94% . It can be done following cataract surgery. The Ex-PRESS has an equally effective intraocular pressure control compared with trabeculectomy, but is safer than trabeculectomy in the short term. In most cases, patients virtually eliminate their need for glaucoma eye drops after Ex-PRESS surgery.

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