The vitreous humor is a colorless, transparent jelly-like substance filled between the lens and the retina and covered with a transparent vitreous membrane. In addition to refractive action, the vitreous body has the role of supporting the retina. The four parts of the cornea, atrial fluid, lens and vitreous humor constitute the refractive medium of the eye, with the common characteristics of being colorless, transparent, and allowing light to pass through, and are therefore collectively referred to as the refractive apparatus of the eye. A lesion in any part of the eye can affect vision and form a refractive error, such as myopia or hyperopia. The accumulation of blood in the vitreous, on the other hand, can cause the refractive media to become blood-stained and blurred in vision. Many patients come to the hospital at first mainly because they feel they have a sudden loss of vision in one eye, blood-stained vision, or flying mosquitoes, which may be the very first manifestation of vitreous hemorrhage, and if not taken seriously by the patient, it is likely to lead to irreversible damage to the eye. A. Causes: 1. Eye trauma: Eye trauma is one of the most direct causes of eye damage, patients pay more attention to the affected eye, and generally actively seek medical attention, so the probability of missing and delaying the diagnosis of vitreous hemorrhage caused by trauma is small. 2, diabetic fundus lesions: diabetes is now a multi-morbidity, and the main hazard of diabetes is microangiopathy. The most important manifestation of diabetic fundus lesions is neovascularization and exudation. The neovascularization is very unstable, with only endothelial cells, but no basal cells and peripheral cells. Blood cells can penetrate the neovascularization, which is the main cause of fundus bleeding. A part of elderly patients do not know that they have diabetes, and a part of diabetic patients do not regularly review the fundus, they think that diabetes does not need to see the ophthalmology, this part is the most likely to cause vitreous hemorrhage, delay the condition of patients. 3, other such as surgery caused by: choroidal hemorrhage and spontaneous hemorrhage. Second, clinical manifestations: spontaneous bleeding often occurs suddenly, can be a very small amount of bleeding, more than the formation of dense clots. When a small amount of bleeding, the patient may not easily notice, or only “flying mosquitoes”; when more bleeding occurs, the patient feels the dark shadows floating in front of the eyes, or seems to have a red glass shade, repeated bleeding patients can feel “smoke”, vision is significantly reduced. In patients with repeated hemorrhage, the patient may feel “smoke” and have a significant loss of vision. Treatment: 1.Medication: In most cases, vitreous hemorrhage can be spontaneously absorbed, and oral hemostatic drugs such as Duyiwei capsule and Longblood Capsules are usually added, and intravenous use of Carlo Juan can stop the hemorrhage. Generally, it should be observed for 1 month, if the vitreous clouding is not significantly reduced during this period, it means that slow spontaneous absorption or complete absorption is less likely. 2.Physical therapy: ultrasound has been reported to treat vitreous hemorrhage, but experiments have shown that the full dose of ultrasound does not accelerate the role of blood absorption. 3.Surgical treatment: (1)Early vitrectomy for ocular traumatic vitreous hemorrhage, it is more appropriate to operate within 1~2 weeks after the injury. The removal of blood clots and inflammatory products in the eye during this period can avoid the over-stimulation of blood on the repair process of trauma, reduce the chance of intraocular fibrous tissue proliferation and retinal detachment by traction, and the possibility of vision recovery is greater. (2) For hemorrhage caused by diabetic fundopathy, if the vitreous blood accumulation has not dissipated after one month, surgical treatment should be actively taken to prevent vitreous blood accumulation from mechanizing, pulling the retina and causing retinal detachment. Vitrectomy is the commonly used surgical procedure. Over time, the blood inside the vitreous dissipates, the color becomes lighter, and the vitreous gradually becomes clear. The absorption of more blood takes 6 months or up to a year or more. In the absence of significant fundus lesions, vision may be fully or mostly restored. In trauma to the posterior segment of the eye combined with massive vitreous blood accumulation, useful vision may be lost in half of the patients.