Seven days after cataract surgery, the failure of intraocular pressure measurement can be caused by a variety of reasons, such as corneal edema, high intraocular pressure exceeding the range of the automatic tonometer, and so on, which need to be judged by the doctor to find out the reasons. Corneal edema: Corneal edema after cataract surgery will affect the tonometer’s ability to capture information from the reflective spots on the cornea, resulting in failure to measure intraocular pressure. Generally speaking, when the corneal edema subsides, the intraocular pressure can be measured normally. Excessive intraocular pressure: If the intraocular pressure exceeds the measuring range of the tonometer, the doctor can initially determine whether the intraocular pressure is too high by measuring the intraocular pressure. If so, the doctor can lower the intraocular pressure by puncturing the anterior chamber and releasing fluids to alleviate the patient’s symptoms of ocular distension and pain. After cataract surgery, we need to follow the doctor’s instructions to do a good job of nursing care and follow-up, and recommend early follow-up treatment when symptoms of discomfort occur.