Would You Believe That Some Women Can See More Colors Than Most of Us?

ray.tomes.biz — The normal human retina's color receptors are tuned to green, blue, and red. Working together, the three give us our colorful view of the world. When one or more of those color receptors is missing the result is color-blindness. While most of us have color vision based on three channels; a tetrachromat has four.