There are two different laser surgeries done for glaucoma. A trabeculectomy is done to open drainage channels in the eye to relieve pressure. Sometimes the channels are clogged, sometimes they are just inefficient. This one is limited in the number of time it can be done. Some surgeons will do half the channel to see if they get enough improvement, then do the other half later if they don't get enough, or if the pressure rises again later.
A laser peripheral iridotomy is done to prevent acute glaucoma due to the iris itself blocking the outflow of fluid, causing the pressure to rise quickly and severely. If recommended, it should be done since acute glaucoma can blind an eye quickly unlike regular glaucoma which is slowly progressive and can be managed by surgical and pharmaceutical means.
Hope this helps.
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