It appears as if David Lubkin <lubkin@unreasonable.com> wrote:
|
|On the island of Pingelap, 12% of the population is totally color-blind.
|They make excellent night fishermen, but they are not considered suitable
|mates by non-achromats. They can't read normal-sized print, or even
|reliably pick berries.
<AHA>
Would total colour blindness imply totally non-functional cones in the eye?
</AHA>
So it seems. A PudMed (MEDLINE) search found:
\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/
Complete achromatopsia is a rare, autosomal recessive disorder
characterized by photophobia, low visual acuity, nystagmus
and a total inability to distinguish colours. In this disease, cone
photoreceptors, the retinal sensory neurons mediating colour
vision, seem viable but fail to generate an electrical response to
light.
\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/
"Genetic basis of total colourblindness among the Pingelapese islanders."
Sundin OH, Yang JM, Li Y, Zhu D, Hurd JN, Mitchell TN, Silva ED, Maumenee IH
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