Bleeding from the left and right eyes may be caused by trauma or abnormal blood clotting. 1. Trauma: As the conjunctival tissue is rich in blood vessels, and at the same time is relatively fragile and directly exposed to the surface of the body, it is easy to be damaged during trauma, which leads to rupture of blood vessels and triggers bleeding, and the patient may have the performance of alternating bleeding between the right and left eyes. 2. Abnormal coagulation function: Abnormal coagulation function refers to the lack of coagulation factors or abnormal function of the patient, which can cause the patient’s fundus or ocular surface blood vessel bleeding, and therefore may appear the symptoms of rotating hemorrhage of the right and left eyes. It is recommended that patients with right and left eye hemorrhage should go to the hospital as soon as possible to assess their condition and take standardized treatment under the guidance of the doctor.