The main cause of subconjunctival hemorrhage is the leakage of blood vessels due to various factors such as rubbing and pressure on the microvessels of the conjunctiva, which leads to the collection of clots in the conjunctiva and subconjunctiva, resulting in a red blood clot in the corner of the eye, also called subconjunctival hemorrhage. The main cause of subconjunctival hemorrhage is sclerosis of small blood vessels or abnormal coagulation function, such as the three high people, such as hypertension, diabetes, these factors are prone to blood vessel rupture and bleeding. For patients with frequent subconjunctival hemorrhage, it is important to undergo regular systemic examinations to check the blood system and blood pressure control. For simple subconjunctival hemorrhage, it can be allowed to absorb on its own, which usually takes about 7-10 days.