Cone cells are photoreceptor cells in the retina of the human eye. They are responsible for color vision and for the detection of fine detail in brightly lit settings. Cone cells come in three varieties, each of which is sensitive to a different colour of light. They are the red, green, and blue cone cells, and they are also referred to as the short-, medium-, and long-wavelength cone cells. When light enters the eye, it is focused onto the surface of the retina, a layer of light-sensitive tissue. This is where the cone cells are located. The cone cells absorb the light and convert it into electrical signals, which are then sent to the brain, where they are interpreted as images. Cone cells are most sensitive to light in the visible spectrum, meaning they can detect light between the wavelengths of 400 and 700 nanometres. This is why they are important for colour vision and the detection of fine detail.