Angle Recession Glaucoma
In angle recession glaucoma, surgery is recommended when the maximum amount of medicine has been tried and failed to reduce IOP and when the risk of vision loss outweighs the risk of surgery. Either laser surgery or conventional incisional surgery in an operating room may be needed.
Although favorable results have been reported for surgical intervention of angle recession glaucoma, success rates are lower when compared to other forms of glaucoma. Your eye doctor will discuss the risks and benefits of each procedure with you.
Argon laser trabeculoplasty
During a trabeculoplasty, the ophthalmologist uses an argon laser beam to place small spots (burns) on the trabecular meshwork, which further open the spaces in the trabecular meshwork, allowing the fluid (aqueous humor) to flow better out of the eye. In effect, this should lower IOP.
- Argon laser trabeculoplasty is successful in the short term, but the procedure is not as effective for the long term, particularly in eyes with angle recession involving more than 180° of the iris.
- In eyes with angle recession involving less than 180° of the iris, argon laser trabeculoplasty is useful if applied only to the part of the angle not involved in angle recession.
Other laser procedures
Laser procedures other than an argon laser trabeculoplasty may be performed. Some recent procedures that have shown promise (but are not discussed herein) include transscleral krypton laser cyclophotocoagulation, transpupillary argon laser cyclophotocoagulation, and endoscopic cyclophotocoagulation.
Conventional incisional surgery
If medicine and laser surgery have failed to adequately control IOP, then conventional incisional surgery (also known as filtering surgery) may be performed. The most common filtering surgery is trabeculectomy.
During trabeculectomy, the ophthalmologist creates an alternate pathway (or drainage channel) in the eye to increase the passage of fluid (aqueous humor) from the eye. By constructing a new drainage channel, aqueous humor is able to flow better from the anterior chamber into a bleb (a space created for drainage of aqueous humor) below the conjunctiva. As a result, IOP is lowered.
Medicines, called antimetabolites, are sometimes used in conjunction with trabeculectomy. They help reduce scarring and increase the chance of IOP being lowered.