Patients with open angle glaucoma usually do not have low intraocular pressure, but low intraocular pressure can occur after surgery, usually due to choroidal detachment, excessive drainage of aqueous humor, incisional leakage and other reasons, and can be treated with medication and conservative treatment under the guidance of the doctor. 1. Choroidal detachment: Choroidal detachment may lead to increased drainage of atrial fluid, which may lead to postoperative low intraocular pressure, and can be treated with drugs such as dexamethasone dexamethasone under the guidance of the doctor, and it is forbidden to treat those who are allergic to the drugs. 2. Excessive drainage of aqueous humor: Excessive drainage of aqueous humor usually results in too little aqueous humor in the patient’s eye, causing symptoms of postoperative low intraocular pressure. Patients can be treated conservatively by applying pressure bandage and closing the surgical incision to reduce the aqueous filtration and improve the symptoms of low intraocular pressure. 3. Incisional leakage: Incisional leakage may cause insufficient accumulation of aqueous humor, which may lead to symptoms of low intraocular pressure, and can be treated conservatively with the help of the doctor by re-sewing the wound. It is recommended that patients with low intraocular pressure consult a hospital in a timely manner to assess their condition and under the guidance of a doctor.