How long the high intraocular pressure lasts will have an effect on the patient’s vision, need to make a judgment according to the high value of intraocular pressure, the rate of progress of intraocular pressure and individual tolerance ability and other factors, the condition is serious, it may affect the vision in a few hours. Normal intraocular pressure ranges from 10 to 21 mmHg, but it is not excluded that some people will not have an effect on their vision even after a long period of time when the normal value is slightly exceeded. In the case of high intraocular pressure due to sudden onset of acute glaucoma or other causes, patients may experience irreversible vision damage within a few hours if left untreated. Various causes that affect the production and flow of aqueous humor can have an impact on IOP. When IOP exceeds the normal limit, there may not be any obvious visual changes or related symptoms in the short term, but if left unattended, there may be an unnoticeable loss of vision after a few weeks or months. It is recommended that patients with abnormal intraocular pressure should seek prompt medical attention to assess their condition and follow the doctor’s instructions for treatment.