Can surgery still be performed in the later stages of glaucoma?

Patient's question:

2012.1.25, eyes swollen, headache, nausea
Past treatment and effectiveness: took many painkillers and blood pressure medications
What kind of help is needed: can surgery be performed, are there other treatment methods besides this?

Doctor's answer:

Hello, high intraocular pressure is a main symptom of glaucoma. Generally, it is recommended to undergo early surgery and early treatment, as the earlier the better. After surgery, intraocular pressure can be controlled. If surgery is performed in the late absolute stage, it is only to alleviate the issue of intraocular pressure, and vision and field of vision cannot be restored. This misses the best opportunity to regain vision and field of vision.
Finally, during treatment, patients need to maintain a balanced diet, follow a regular schedule, actively participate in physical exercise, regulate physical and mental health, and maintain personal hygiene to avoid bacterial invasion due to weakened immunity.