Fig. 1.

Flowchart demonstrating number of patients included and excluded from analysis

^aDiagnoses include proliferative diabetic retinopathy, diabetic macular edema, vitreous hemorrhage, tractional retinal detachment, sickle cell retinopathy, “other retinopathy”, retinal artery or vein occlusion, cystoid macular edema, retinal edema, or separation of retinal layers.

^bTreatments include vitrectomy or laser therapy.