Oxygen and the retinal blood vessels.
D000818:Animals; D002415:Cats; D002455:Cell Division; D006801:Humans; D007231:Infant, Newborn; D009389:Neovascularization, Pathologic; D010101:Oxygen Consumption; D012171:Retinal Vessels / Q000254:growth & development* / Q000378:metabolism; D012178:Retinopathy of Prematurity / Q000517:prevention & control