The appearance of white mucous membrane on the surface of the eye is usually due to the following causes: first, due to conjunctival edema, such as mechanical irritation caused by rubbing the eyes or allergies, which may cause a large amount of fluid to accumulate in the interstitial space of the conjunctival tissue, resulting in edema, which can usually be reduced by applying cold compresses with ice towels. Second, due to lid lacrimation, the conjunctival tissue on the surface of the white eye becomes abnormally hyperplastic, resulting in a white membranous structure, which is common in middle-aged and elderly people and workers who are exposed to strong sunlight for long periods of time, and can be surgically removed to improve its appearance. Thirdly, conjunctival lymphatic cysts are caused by the blockage of lymphatic vessels in the conjunctiva, resulting in the formation of small cysts of lymphatic fluid, usually in clusters, which look like a layer of mucous membrane on the surface of the white eye.