Red blood clots in the eye, also known as subconjunctival hemorrhage, can be applied locally with cold compresses in the early stage, and can be changed to hot compresses after three days, which can promote the absorption of accumulated blood twice a day. If it is accompanied by symptoms such as dryness and itching, diclofenac sodium drops can be applied. The common cause of subconjunctival hemorrhage is the rupture of blood vessels in the bulbar conjunctiva, such as rubbing the eyes, strenuous exercise, and dry stools can cause the rupture of blood vessels in the bulbar conjunctiva. Another common cause is increased vascular permeability, which is common in patients with vascular diseases such as hypertension and diabetes, and results in bleeding due to increased permeability of the vascular endothelium. Because subconjunctival hemorrhage does not affect vision, there are no sequelae after the hemorrhage is absorbed.