A fluorescein angiogram should be obtained when the hemorrhages have cleared if the patient's vision is still reduced. Tests are usually done 3 months after the event.
Purpose of test is to determine cause of visual loss (macular edema or ischemia). If visual loss is secondary to macular edema, laser photocoagulation in a grid pattern may be of benefit (See BVOS Study Results) . If macular ischemia is responsible for the loss of vision, laser photocoagulation should not be offered to the patient.
A FA is also useful for showing precise site of venous obstruction if surgery is contemplated.
Of note, an OCT can be obtained to follow macular edema.