Before the advent of OCT, FA was the standard tool used to diagnosis macular edema. The finding of a ''petaloid'' pattern of late leakage is classic for the diagnosis of cystoid macular edema.

An OCT is a non-invasive test that uses light to obtain images showing macular edema. Sometimes, doctors also use a dye-injection test so that blood flow can be analyzed through the macula.

Most of OCT findings in both groups showed subretinal fluid and/or intraretinal edema but very few cases had cystoid macular edema. The baseline fluorescein leakage pattern of most cases (52 eyes ...