Question: what is proliferative sickle cell retinopathy?
Answer: Proliferative sickle cell retinopathy (PSR) is a vision-threatening complication of sickle cell disease (SCD). Ischemic events in the retina stimulate angiogenesis, resulting in retinal neovascularization. SCD is caused by a mutation in the HBB gene, which encodes hemoglobin beta.