Sudden blurred eyes like a layer of fog, generally refers to sudden blurred vision, the first thing to consider is whether the recent use of excessive eye fatigue, or not pay attention to eye hygiene and other bad eye habits, may cause sudden blurred eyes like a layer of fog situation, after rest and improve eye habits symptoms can be quickly recovered, generally no sequelae. In addition, some eye diseases can also cause sudden blurred eyes like a layer of fog: 1, refractive error: myopia, hyperopia, astigmatism and other refractive errors, if not wearing corrective glasses or lens degree is not appropriate, some people may appear sudden blurred eyes like a layer of fog, it is recommended to wear suitable frame glasses or contact lenses to correct vision, if necessary, feasible 2, glaucoma: associated with increased intraocular pressure, if glaucoma patients with a sudden increase in intraocular pressure within a short period of time, may cause pressure on the eye structure, impede the normal eye fluid circulation, and then affect vision, can appear suddenly blurred eyes like a layer of fog, may also be accompanied by eye distension, headache, nausea and other symptoms, should receive timely treatment to reduce intraocular high pressure, such as the use of laser, surgical treatment, follow the The treatment should be timely, such as using laser and surgery, using eye drops to lower intraocular pressure such as timolol and latanoprost, or oral medications to lower intraocular pressure such as vinpocetine tablets. 3. cataract: due to the clouding of the lens in the eye affects vision, usually progressive vision loss, but the sudden appearance of cloudy objects in the center, blocking vision, may cause sudden blurring of the eyes like a layer of fog, mostly in the elderly, may have diplopia, If surgery is not possible, glutathione drops can be used to delay the symptoms; 4. Iriditis: Iriditis, due to the exudate produced by the eye under the stimulation of inflammation, can cause the patient to have sudden blurred eyes like a layer of fog, accompanied by eye redness, pain, photophobia, tearing and other symptoms. The eye drops, such as tropicamide drops, tobramycin dexamethasone drops, etc., can be used under the guidance of a doctor, and in severe cases, oral anti-inflammatory drugs can also be used to treat the condition; 5, other: fundus hemorrhage, retinal detachment, central retinal vein obstruction and other ophthalmic diseases may cause the patient to have a sudden blurring of the eyes like a layer of fog, it is recommended to seek medical advice to clarify the cause, the symptoms can be restored after the elimination of the primary cause. In addition, the elderly need to be alert to the presence of stroke, because the sudden blurring of vision caused by nerve abnormalities in the brain, stroke patients may also be accompanied by crookedness of the corners of the mouth, slurred speech, shallow nasolabial folds and other symptoms, once suspected of having a stroke, should be sent to the doctor in a timely manner.