I had glaucoma surgery. At present, the intraocular pressure 10-20, and the physiological blind spot of the left eye is enlarged in visual field examination. Why is this happening? The doctor said it

I had glaucoma surgery. At present, the intraocular pressure 10-20, and the physiological blind spot of the left eye is enlarged in visual field examination. Why is this happening? The doctor said it doesn't matter, the right eye is worse. The physiological blind spot is enlarged because your previous glaucoma attack caused irreversible damage to your optic nerve. What we need to do now is to check the intraocular pressure regularly to prevent the intraocular pressure from rising without warning and causing damage to the optic nerve again. Usually, the intraocular pressure is measured every three months and the visual field is measured every six months after glaucoma surgery.