Cones are the photoreceptor in our retina that let us see in color. Cone cells are located deep in our retina and come in three different varieties, each sensitive to a different color spectra: red, green, and blue. Cones are very important for daylight vision and also for detecting fine visual needed to read small print. The macula, the central part of the retina that’s responsible for our fine vision, is composed primarily of cones with more rods located in the peripheral retina. People with color blindness typically have a genetic problem with one of their cone types.