Macular edema refers to the inflammatory reaction and fluid infiltration in the macular area, which is the most sensitive part of the fundus retina to light, resulting in edema, which leads to a serious decline in vision. It is central retinal vein occlusion and diabetic retinopathy, and it is also one of the important reasons for the decline of vision. The causes of macular edema are very complicated. In addition to ocular diseases such as uveitis, retinopathy and macular degeneration, some systemic diseases can also cause macular edema, such as diabetes and hypertension. Therefore, the treatment of primary disease is the main. Macular edema refers to the inflammatory reaction and fluid infiltration in the macular area, the most sensitive part of the retina, which leads to a serious decline in vision. It is central retinal vein occlusion and diabetic retinopathy, and it is an important cause of decreased vision.