Macular edema is a serious disease, because once macular edema occurs, it will definitely lead to a sharp decline in vision, even to the extent of the manual hand in front of the eyes, so after this symptom appears, you must go to the hospital for relevant examinations as soon as possible to clarify the specific cause. The causes of macular edema usually include retinal vein obstruction, retinal perivasculitis, diabetic retinopathy or internal eye surgery such as cataract surgery and vitrectomy. Injections, this disease must be paid attention to, if it is not controlled in time, it may form macular fissure, and the impact on vision will be greater.