Posted: Sep 12, 2012 2:34 pm
by DavidMcC
It is also possible that they are tritanopians, but with both MW opsin alleles, so that they don't see blue, but see a lot of shades of green:

Note that violet would then appear as a dark shade of red.

Comment #1, by a certain "Digby", is especially interesting from the point of view of the Himba's powers of green vision. Perhaps he should have been given the eyesight test used on the Himba, as well as genetic testing for opsin alleles that may have been missing in the work on the Himba.