...between Dr. Knut Nordby describing himself in the link in the story and the artist (and claudius, I'll guess) may be due to the nature of the cause of colorblindness.
Rod photoreceptors can only respond to light/no light, whereas the cone photoreceptor cells have photopigments tuned to more specific wavelengths of light. Most cases of red/green colorblindness result from a loss of one of the photopigments. The cone cells are by far the more numerous receptors in the retina, and are concentrated at the fovea, where the eye is designed to most optimally focus its input.
Dr. Nordby has no cone cells. None. Not only does he lose color, but he also loses the majority of his visual receptors. His best condition for vision is our worst -- twilight.
In the case of the artist who lost color vision, the loss was brought about by a head injury which affected brain areas responsible for cognition related to color. The receptor cells were intact, and the input from the cells was still processed. He lost no acuity for brightness or contrast. One could be tempted to guess that the "increased acuity" was due primarily to the lack of distraction by color information.
That said, I once worked with a colorblind lighting director. He could run a respectable light show for any band, just as long as someone else picked the colors. He had no perception of green.
You cannot have a reasonable conversation with someone who regards other people as toys to be played with. localroger
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