Glaucoma is a nerve-damaging disease that is irreversible and is now the second most common blindness-causing eye disease worldwide (cataract is first), but the first irreversible blindness-causing eye disease. Therefore, once you have glaucoma and optic nerve damage has occurred, no treatment can reverse the condition. The goal of glaucoma surgery is to reduce the pressure in the eye to prevent continued damage to the optic nerve from high intraocular pressure, thereby slowing or ending the progression of the glaucoma condition. Surgery itself cannot improve a patient’s vision. In general, glaucoma surgery does not have much effect on vision either, and the vision after surgery should be the same as before surgery. However, the surgery itself interferes with the normal structure of the eye and may have some effect on vision for a short period of time, but it will not cause substantial damage. Short-term vision changes after surgery are usually caused by the following reasons: 1. Depending on the condition, sutures may be required at the corneal edge during surgery, which may affect the shape of the cornea due to the tension of the sutures, causing mild deformation of the cornea, i.e., it will have some effect on the corneal curvature. And the local change in corneal curvature may cause astigmatism, which affects the refractive state causing vision changes. After the sutures are removed, the corneal curvature will return to its original state and the vision will be restored. 2. In some glaucoma patients, the presence of the filter vesicles after surgery will have a certain effect on the corneal curvature and the tear film on the eye surface. The magnitude of the effect depends on the degree of augmentation of the follicle. If there is an impact, generally after the filter vesicles are stabilized for 3 months after surgery, the impact will not change, and the vision can be restored by wearing glasses to correct this partial change. 3, after surgery, due to the inflammatory reaction, bleeding and other reasons, may cause the atrial water turbidity, affecting vision. When the inflammatory reaction disappears, the bloody atrial fluid is absorbed, and the atrial fluid is clear, the vision will be restored. 4. For vision loss due to optic nerve atrophy caused by glaucoma, most patients’ vision cannot be restored even if the IOP is normal after surgery. For some infants and children with glaucoma, there may be a small amount of recovery due to their own strong recovery ability.