Fully colour blind people were used to spot camouflaged objects during WWII so they do have their uses.
As a "mild red/green defective",when I look at the Ishihara plates, I think I see MORE variations of the red and green colours than normal people do which is why the numbers do not stand out clearly as normal people describe. PeterS ----- Original Message ----- From: "Andrew McGrath" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Wednesday, November 30, 2005 8:45 AM Subject: RE: [Aus-soaring] colours > Hi, > > I used to work in airborne instrumentation with a heavily colour-blind > scientist. He would occasionally pop out from under an aircraft > instrument panel clutching a bundle of coloured wires to ask "which one > of these is red?" before diving back into the bowels to make some > critical connection. > > On the other hand, I was flying with him near Wagga doing airborne > studies of crops at different stages of growth (cropdusting-type flying > with instruments), and found that he could easily distinguish between > crops at different stages of growth that all looked to the same shade of > green to me (and I pass the Ishihara tests with the correct numbers > sticking out like {very obvious things}, hold a CPL, and believe my > vision to be normal). He also had a tendency to choose colours for plots > of data that were very difficult for everyone but him to see (e.g. light > yellow wiggly line on a pale yellow background, projected on the wall > during a presentation to a roomful of people). > > And the colours he'd select for his clothes were disastrous. ;-) > > Can any medical types suggest if this is common - an ability of > colourblind people to _better_ distinguish some other colours? > > I must say, in terms of aviation and colour blindness, I do wonder why > the focus often seems to be on the ability/disability of colour blind > people to use existing colour cues in navigation and instrumentation, > rather than designing and standardising different colour schemes and > other cues to eliminate the dependence on 'normal' colour vision. > > Cheers, > > Andrew. > _______________________________________________ Aus-soaring mailing list [email protected] To check or change subscription details, visit: http://lists.internode.on.net/mailman/listinfo/aus-soaring
