Patients with one eye suddenly blurred, can not see, like a layer of fog, to rule out lens fogging or appropriate rest is still not relieved, need to be vigilant about glaucoma and other sudden pathologic factors, the patient can be treated with medication and so on. Blurred vision can occur after a long period of eye use or refractive error and other causes of blurred vision, can be relieved after resting or optometry to adjust the brightness of the environment to prolong the duration of eye use, may also be a change in ambient humidity leading to lens fogging, timely wiping can be restored. Sudden blurring of vision in one eye can also occur in a variety of eye diseases, such as acute glaucoma, the patient because of increased intraocular pressure corneal edema, thus affecting vision, the patient needs to lower the intraocular pressure treatment, such as the use of drugs to reduce intraocular pressure as prescribed by the doctor, such as brinzolamide drops, and also feasible surgical treatments, such as trabeculectomy, etc, to alleviate the discomfort of the eye. It is recommended that patients with sudden onset of blurred vision that does not resolve over a long period of time seek medical attention to evaluate their condition and follow the doctor’s instructions for treatment.