Blurred vision after driving for a long time is usually caused by visual fatigue, dry eye, etc. In addition, refractive error, cataract and other diseases need to be ruled out. Visual fatigue: patients driving for a long time attention is highly concentrated on the distant scenery in front of them, after a long time will cause fatigue of the ciliary muscle inside the eyeballs and other muscles that play the function of regulation, which will make the patients have temporary blurred vision. You should stop the car as soon as possible to rest and let your eyes relax. Dry eye: Long hours of driving, turning on the air conditioning or warm air leads to dry air inside the car, etc. Dry eye is easy to cause, and the patient will also be lack of tears on the eye surface and cause temporary blurred vision. Patients need to stop the car to rest their eyes, and artificial tears such as sodium vitrate eye drops are given to treat the symptoms if necessary. Medications need to be used as prescribed. If the symptom of blurred vision is still not relieved, it is necessary to go to the ophthalmology department of the hospital as soon as possible to see if it is caused by other reasons, such as refractive error, cataract, and so on. Refractive errors usually require glasses or refractive surgery to correct vision, and cataracts usually require surgery. There are many reasons for blurred vision when driving for long periods of time. If resting does not relieve the blurred vision, you should seek medical attention for examination and treatment under the guidance of your doctor.