Anterior-segment OCT (AS-OCT) and Intraoperative OCT (iOCT) for Trans- Conjunctival Needle Revision (TCNR)

Trabeculectomy is a very important and commonly performed glaucoma operation. It allows fluid from inside the eye to exit into a space called a bleb located on the surface of the eye under the upper eyelid. The formation of excessive scar tissue after surgery may cause the operation to work less well or stop working. This results in an increase in eye pressure. The use of a needle to cut the scar tissue is a commonly used procedure. This surgery is called trans-conjunctival needle revision (TCNR) of trabeculectomy bleb. The study aims to determine if advanced optical imaging called Optical Coherence Tomography (OCT) of the scar tissue both in the office prior to surgery and during surgery in the operating room improves the success rate of the revision surgery. These devices are FDA approved and have been used extensively in ophthalmology and ocular surgery. Ophthalmologists already used these imaging devices for this purpose as part of the standard medical care of some patients. The purpose of this study is to prospectively gather information about its use in a systematic way. Furthermore, investigators want to determine if imaging improves outcomes compared to historical controls (patients who underwent the same surgery in the past without imaging). The potential benefit of this research is that it may provide knowledge that will be of benefit to future patients with glaucoma who are undergoing this procedure.