The macula or macula lutea (from Latin macula, "spot" + lutea, "yellow")'s an oval-shaped highly pigmented yellow spot near the center of the retina of the human eye. It's a diameter of around 5 mm and's often histologically defined as having two or more layers of ganglion cells. Near its center's the fovea, a small pit that contains the largest concentration of cone cells in the eye and's responsible for central vision, and also contains the parafovea and perifovea. Because the macula's yello… (More on Macula)