The most sensitive part of the retina is called the fovea centralis. It is located at the center of the macula lutea, which is a small yellowish spot in the retina responsible for central vision. The fovea contains a high concentration of cone cells, which are responsible for color vision and visual acuity (sharpness of vision). The fovea is important because it allows us to see fine details and perceive colors with greater clarity than other parts of the retina.