Pugh's brother and grandnephew had protanope colour vision deficiency and it is probable that he did on biographical, gene pedigree inheritance and other grounds ( such as failing the colour vision test when endeavouring to enlist in the Navy ).
2.
That would mean they have color vision similar to a human protanope ( " red-blind " ) in the daytime, but might also have some nighttime color discrimination ( unlike humans ) .-- talk ) 20 : 30, 13 July 2010 ( UTC)
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