If you’re colorblind, that means there's a problem with at least one kind of cone. Those cones could be missing, or they might pick up a different color than they should. For instance, some cones could have defective genteic coding for specific color sensitive chemicals. Either way, they can’t send your brain the right information. Since the cones also help you see the fine details of what you’re looking at, colorblindness might also make you see a little less sharply.