Polyvinyl alcohol eye drops and sodium vitrate eye drops are both artificial tears that are more commonly used in clinical practice, the difference mainly lies in the different ingredients. The trade name of polyvinyl alcohol eye drops is Rui Zhu, and the most common trade name of sodium vitrate eye drops is Tearran. Both add mucilage to the drops, thus simulating the effect of tears to prevent volatilization, mainly for dry eyes. Also for allergic conjunctivitis, diluting the allergic substance through artificial tear drops can have some anti-itch effect. In addition, polyvinyl alcohol eye drops are packaged in single sticks without preservatives, daily disposable type, 1 drop/day, 4-5 times/day, and sodium glassate 5ml/bottle, which has preservatives inside, so 1 bottle is used for a longer period of time, and can be used for about 1 month. The specific use of different eye drops can be targeted according to your own feelings.