It is the area of best vision where maximum amount of cone cells are present.It is also known as fovea centralis and Macula Lutea The maximum of sensory cells are present at this spot. It is another name of macula. It is subdivided into the umbo, foveola, foveal avascular zone, fovea, parafovea and perifovea areas. It has a diameter of 5.5mm in humans. They contain the pigment Iodopsin and respond to bright light and Colour,because of which we can see stuff clearly around us.
It is responsible for the central, high-resolution, colour vision that is possible in good light; and this kind of vision is impaired if it is damaged. It is about in 6mm in diameter