A red plane of blood below the anterior chamber is a symptom description of anterior chamber hemorrhage. After an eye injury, increased permeability of the iris vessels or accumulation of blood in the anterior chamber due to ruptured vessels bleeding is called traumatic anterior chamber hemorrhage. Small amounts of anterior chamber hemorrhage do not cause serious damage, but in large amounts the complications and accompanying lesions can have serious consequences for visual function. What is the primary cause of red blood planes below the anterior chamber? Hemorrhage-associated glaucoma includes anterior chamber hemophakic glaucoma, hemolytic glaucoma and hematocrit glaucoma, of which anterior chamber hemorrhage is the most common. Other rare spontaneous anterior chamber hemorrhages include intraocular tumors, neovascular glaucoma, ocular cholesterol deposition disease and sickle cell disease. Ocular contusion is an important causative factor for anterior chamber hemorrhage, and the causative agents include slingshot, throwing, ball, and fist and elbow injuries. The incidence of intraocular hemorrhage in internal eye surgery combined with anterior chamber hemorrhage is becoming less frequent with the popularity of microsurgery and improved surgical skills. Spontaneous anterior chamber hemorrhage is less common and can be caused by the following: intraocular tumors, iris redness, fibrovascular membrane hemorrhage in the posterior lens or suspensory area, medications, etc.