Patients with elevated intraocular pressure (IOP) are prone to eye congestion, blurred vision, headaches, eye swelling, and nausea and vomiting. If the elevated intraocular pressure is uncontrollable, ciliary congestion may also occur, and in severe cases, symptoms such as haze vision and iris vision may occur. 1. Eye congestion: Increased intraocular pressure will make the scleral collecting ducts and superficial scleral blood vessels dilated, which will lead to eye congestion symptoms. At the same time, if the patient’s intraocular pressure increases persistently, the symptoms of eye congestion will be more obvious, and even ciliary congestion may occur. 2. Blurred vision: It is due to the patient’s long-term improper use of eyes, so that the eyes are in a state of long-term fatigue, and thus the patient’s intraocular pressure is elevated. The increased intraocular pressure caused by this reason will harm the patient’s optic nerve, so that the patient’s visual acuity is significantly reduced, and may also cause foggy vision. 3. Headache and nausea: Patients with elevated intraocular pressure (IOP) may also experience headache, eye swelling, nausea and vomiting. This is because increased intraocular pressure can compress the patient’s trigeminal nerve, which is a nerve that conducts sensations such as warmth and pain. Therefore, when the trigeminal nerve is irritated, patients often experience headaches and eye swelling. Patients who experience significant and uncontrollable elevation of intraocular pressure are advised to go to the hospital immediately for treatment.