Methyl cellulose is a chemical component with good properties of wettability, adhesion, dispersibility, thickening and water retention. In ophthalmology, it is mainly used to make artificial tears, the main effect is to induce the secretion of tears, ensure the stability of the tear film and reduce the evaporation of tears. It is clinically suitable for relieving eye fatigue and dryness due to prolonged reading and computer use, excessive eye fatigue or prolonged exposure to air-conditioning environment, resulting in rapid evaporation of tears.