Rods are responsible for vision at low light levels, they are not involved in color vision and have low spatial acuity. Rods are more sensitive to light than cones. The cones are active at higher light levels, are able to see colors, and are responsible for high spatial acuity, resulting in sharp images. Rhodopsin is the light-sensitive pigment in rods. Rhodopsin molecules break down into a protein called opsin and an organic compound called retinal that makes vitamin A. Iodines are the light-sensitive pigments in cones. They contain proteins different from those