Sudden blurring of vision in the right eye may be caused by acute closed angle glaucoma, retinal vasospasm, keratitis, etc. Patients can follow the doctor’s instructions to use medication, and if necessary, surgical treatment. 1. Acute closed-angle glaucoma: acute closed-angle glaucoma patients because of the sudden closure of the atrial angle, which can cause a sharp rise in intraocular pressure, can appear suddenly blurred vision, severe pain in the eyes of the clinical manifestations. Patients can follow the doctor’s instructions to use medication, such as hairy fruit rutaecarpine eye drops, etc., to reduce intraocular pressure and alleviate the symptoms of discomfort. If the effect of medication is unsatisfactory, the patient can be treated with surgery, such as trabeculectomy. 2. Retinal vasospasm: patients with retinal vasospasm may have transient blurred vision, which can be relieved after rest. 3. Keratitis: The cornea of patients is damaged by microorganisms, trauma and physical and chemical stimuli and inflammation occurs, resulting in clouding of the cornea, and patients may experience blurred vision, pain and other uncomfortable symptoms. Patients can follow the doctor’s instructions to use tobramycin eye drops and other drugs to control inflammation and promote vision recovery. It is recommended that patients with sudden onset of blurred vision should seek prompt medical attention to assess their condition and follow the doctor’s instructions.