Macular edema may generally have a reduced effect in about a week after the injection. There are many causes of macular edema, such as diabetic retinopathy, infection, etc. The treatment is generally to treat the primary disease. If the symptoms of macular edema are serious, the doctor may give intraocular injection of trimethoprim injection and anti-VEGF drugs, and the symptoms of edema can be relieved in a week or so after the treatment, and the vision of the eyes can be restored to different degrees. Because Tretinoin injection is a glucocorticoid, there may be an increase in intraocular pressure after use, and the eye may be distended and uncomfortable, so it should be reviewed regularly in the hospital. Macular edema injection should be timely to the regular hospital review, by the doctor according to the symptoms, signs and auxiliary examination to determine the specific recovery, such as intraocular pressure rise phenomenon may require timely treatment.