The first is physiological. In normal eyes, there are glands inside the eyelids that secrete oil all the time, which, after being secreted into the conjunctival sac, can maintain the lubrication and moistening effect of the eye surface and reduce the possible damage of the eye surface exposed to the environment. The secretions produced in the physiological state are usually not easily detected during the day when the eyes are open, but it is possible that during nighttime sleep, when the eyes are closed, the secretions may gather in the corner of the eyes after the flushing of tears and after a night’s sleep, and the eye droppings in the corner of the eyes are observed after waking up. The second is a pathological condition in which the production of this kind of eye discharge may be due to a variety of reasons that lead to inflammatory reactions in the conjunctiva of the eye surface. In the course of these inflammatory reactions, the body’s immune cells produce secretions in response to the inflammatory reactions, and these secretions are produced under specific pathological conditions, i.e., white or yellow eye droppings that are usually observed during the day. The presence of excessive eye discharge indicates inflammation of the ocular surface, and further targeted treatment is required depending on the cause of the inflammation, whether it is infectious or immunologic. After the inflammatory reaction has subsided, the excessive discharge can be relieved and normal conditions can be restored.