Glaucoma surgery is surgery to lower pressure inside the eye.

Glaucoma
Glaucoma
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It is done to treat glaucoma. The inside of the eye is normally bathed by a clear fluid. The fluid flows in and out of the front chamber of the eye. In most cases of glaucoma, this fluid flows too slowly out of the eye. The fluid builds up and increases the pressure inside the eye. If this pressure is not controlled, it can cause damage to the eye and loss of vision. This surgery is done to lower the amount of pressure in the eye. Decreasing the pressure may be needed to prevent further loss of vision.

It is important to note that while glaucoma surgery may save your remaining vision, it does not improve or restore sight.