A blood clot in the eye is a subconjunctival hemorrhage, caused by the rupture of a subconjunctival blood vessel, which can usually be eliminated within 1 week, depending on the individual. Subconjunctival blood vessels are weak and can be easily affected by rupture. Factors that can affect this include staying up late, excessive eye use, straining, coughing, vomiting, etc. Initially, the subconjunctival hemorrhage is bright red, and then the clot spreads to the periphery and accumulates confined to form a blood clot. If it does not affect vision and is not accompanied by other symptoms, patients can apply cold compresses within 2 days of bleeding to prevent the bleeding from increasing, followed by hot compresses to promote blood circulation, and the clot can usually be completely absorbed within 1 week. If the patient often has a blood clot in the eye, it is recommended to visit the ophthalmology department in a timely manner to clarify the cause and then treat it symptomatically, and the specific elimination time cannot be clarified. Therefore, when patients have blood clots in the eyes should try to use their eyes less, pay attention to rest, avoid staying up late and eating spicy and stimulating food, and pay attention to the time of cold compresses and hot compresses.