Ocular thrombosis is a condition in which the blood vessels supplying the eye are blocked by blood clots, resulting in interruption of blood flow and a severe ischemic state of the retina, leading to a sudden and complete loss of visual function. Diabetes mellitus, high blood pressure, and arteriosclerosis can all lead to ocular thrombosis. 1. Ocular thrombosis caused by diabetes mellitus: people with diabetes mellitus who have poor long-term blood sugar control will lead to microangiopathy, thus causing fundopathy. Diabetic patients should pay attention to blood sugar control, light diet. 2. Eye thrombosis caused by hypertension: if hypertensive patients with long-term blood pressure control is not good, especially patients in a long time to stay up late at night or under the state of excitement, the aneurysm will rupture, the symptoms of eye congestion, thus forming eye thrombosis. Therefore, for hypertensive patients, only if the blood pressure is controlled within the normal range, can we prevent hypertensive eye thrombosis. 3. Eye thrombosis caused by atherosclerosis: patients with atherosclerosis, most of the blood vessel walls of the eye arteries will also undergo localized atherosclerosis, resulting in loss of elasticity of the blood vessels of the eye, which may cause fundus thrombosis and other lesions under the influence of diabetes mellitus, high blood pressure and other risk factors. No matter which cause of ocular thrombosis is a more serious eye disease, it is recommended to go to the ophthalmology department as soon as possible to receive timely treatment.