Typical total color blindness, achromatopsia or rod monochromatism, is inherited as an automal recessive condition and is thought to result from absence of cone function. Rod monochromats have been used in basic visual studies as models of normal human rod vision and to study rod vision without interference from cone receptors. This was under the assumption that they only have rods, that their rods are like normal rods, and that rod-cone interaction is not important or doesn't exist. Transient tritanopia in a blue cone monochromat. J. Pediatric Ophthalmol.
Age changes in the optical density of human ocular media.
Clinical Vision Science.