The macula lutea is the yellow oval spot at the center of the retina (back of the eye). It is responsible for sharp, detailed central vision (also called visual acuity).
Yanoff M, Cameron D. Diseases of the visual system. In: Goldman L, Ausiello D, eds. Cecil Medicine. 24th ed. Philadelphia, Pa: Saunders Elsevier; 2011:chap 431.