Cones are a type of photoreceptor cell found in the retina of the eye. They are responsible for color vision and function best in bright light conditions. There are three types of cones, each sensitive to different wavelengths of light: short-wavelength (blue), medium-wavelength (green), and long-wavelength (red). This combination allows humans to perceive a wide range of colors. In addition to their role in vision, cones are essential for visual acuity, which is the ability to see fine details. They are concentrated in the fovea, the central part of the retina, where light is focused for sharp vision.