If you have poorly controlled glaucoma, your Doctor may advise trabeculectomy surgery. A trabeculectomy involves creating a new drainage channel so that aqueous fluid can leave the eye more easily. Your surgeon may also create a small opening in the iris to aid aqueous outflow. The new drainage channel allows fluid to pass out of the eye into the space underneath the outer layer of the eye, called the conjunctiva. A successful trabeculectomy results in lowered eye pressure. Vision recovery may take a few weeks. It is generally not advisable to change glasses for 3 months. During the first month, avoid heavy lifting and strenuous activity. Ask your Doctor before swimming.