What is the reason for the vision?

If young people show blurred vision symptoms, mainly because of poor ability to adjust far and near caused by eye fatigue. If middle-aged and elderly people show this symptom, this is caused by age, is a manifestation of aging, belonging to physiological. The former can be relieved by dropping mydriatic eye drops or increasing the ability to adjust far and near, such as looking five meters away, then looking closer, so repeated. The latter does not need treatment, you can wear glasses or laser surgery. If you usually stay up late or use your eyes too much, you must pay attention to adjustment, especially to reduce the time to see things at close range, such as mobile phones, computers and other electronic products.