#1	"Anemia, Sickle Cell"[Mesh] OR "sickle cell*"[tw] OR SCD[tw] OR Hbss[tw] OR HbSC[tw] OR "hemoglobin C"[tw] OR "haemoglobin C"[tw] OR "hemoglobin S"[tw] OR "haemoglobin S"[tw] OR " Hb-thal"[tw] OR "beta thalassemia*"[tw]
#2	"Retinal Diseases"[Mesh] OR "Eye"[Mesh] OR "Vision, Ocular"[Mesh] OR "Vision Disorders"[Mesh] OR "Visual Acuity"[Mesh] OR "Vitreous Hemorrhage"[Mesh] OR "Retina"[Mesh] OR retina*[tw] OR retinopath*[tw] OR eye[tw] OR eyes[tw] OR vision[tw] OR visual[tw] OR sight[tw] OR ocular*[tw] OR acuity[tw] OR acuities[tw] OR proliferative[tw] OR nonproliferative[tw] OR fundus[tw] OR vitreous[tw] OR macular[tw] OR "spontaneous regression"[tw] OR neovascular[tw] OR "sea fan"[tw] OR "salmon patch*"[tw] OR sunburst*[tw] OR vitreoretinopath*[tw] OR hemian-opsia*[tw] OR optical[tw]
#3	#1 AND #2