The surgery is basically the same as the other one, but this one is to treat glaucoma. During surgery, the eye is numb, so there is little to no pain. Then the doctor holds a special beam on the eye, this is a bright light, like a camera flash. There are many types of surgeries to treat glaucoma, but the main one we will talk about is argon laser trabeculoplasty (ALT). This is a treatment of primary open-angle glaucoma. The laser beam in this case is used to open the fluid channels of the eye, help the drainage system and in many cases medications may be necessary. Usually half of the fluid channels are treated first. The other half can in most cases be done during the same visit. This method prevents overcorrection and has a success rate of 75% of patients successfully treated to lower eye pressure. The procedures in both cases are simple with very few complications, check and see what may or may not work for you. This surgery began in 1985, but became more popular in the 2000s. This is a procedure that does not take all day, but it would be advisable to bring someone with you