Retina
The center of the human retina, called the fovea centralis, or just fovea, has the most [cone cells] for sensing bright colors and fine detail of a viewed object. Even though the fovea takes up only 1.5 square millimeters, it plays the most important role in vision.  It is only around 1% of the human retina, but the fovea sends about as much information to the visual cortex as the rest of the retina combined.