Eye strain is a very common disease in ophthalmology, the main symptoms are as follows: First, transient blurred vision, after a long time of close eye use, eye strain is easy to form, then look at distant scenes will feel less clear than the original, and in serious cases, even look at close things also feel blurred, pay attention to rest, such as closed eyes for about 10 minutes, vision can be restored. Secondly, the eyes are sore and swollen, and sometimes there is headache and dizziness, and the spasm pain caused by over-regulation of the ciliary muscle when the eyes are tired. Third, redness of the eyes, eye fatigue can lead to reactive conjunctival vasodilation and congestion. Fourth, dry eyes are due to prolonged overuse of the eyes triggered by the tear film function of the eye surface is reduced, the eyes will appear astringent, dry, photophobia, etc..