The best time to treat vitreous hemorrhage, i.e., as soon as it occurs, is as soon as possible. The early stage is conservative treatment, and in the middle and late stage, the cause of the bleeding has to be found, such as diabetes, venous obstruction, and trauma. In the past, if the blood is not absorbed in 3 months, biosurgery is needed; now the time is changing, basically determined in about 3 weeks, because 3 weeks of time basically bleeding in the vitreous, slowly causing posterior detachment of the vitreous and retina. There are several locations where the vitreous and retina are more tightly connected, including the optic disc, blood vessels, macular area, and of course very tightly connected to the vitreous base. If the surgery is done early, an artificial posterior vitreous detachment is required, which can easily lead to artificial fissures in the retina or macula, so the surgery will be done in a larger scale.