Sudden increase in intraocular pressure and blurred vision may be caused by glaucoma, cataract and iridocyclitis. 1. Glaucoma: In acute attacks of glaucoma, the intraocular pressure may increase, causing corneal edema, which leads to blurred vision, eye swelling, eye pain, photophobia and other uncomfortable symptoms. 2. Cataract: The swelling of the lens in cataract patients can cause the iris to move forward, resulting in the narrowing of the angle of the atrium, which leads to a sudden increase in intraocular pressure and blurred vision. 3. iris ciliary inflammation: iris ciliary inflammation patients due to inflammation stimulation, can also appear in intraocular pressure rise, blurred vision performance, patients may also appear photophobia, pain and other uncomfortable symptoms. It is recommended that patients with elevated intraocular pressure and blurred vision consult a doctor to evaluate their condition and follow the doctor’s instructions for treatment.