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CHAT: Ultraviolet (was: Orange)

From:John Cowan <jcowan@...>
Date:Thursday, June 13, 2002, 10:46
Lars Henrik Mathiesen scripsit:

> The source I read didn't go into stuff like how many different colours > he perceived in the new wavelengths, or how much it changed the look > of everyday objects --- more that his colleagues though it was neat > how he could calibrate their UV spectrometers without a photometer.
People in this position (and they are not rare; the treatment for cataract is to remove the lens, and most of us get cataracts in our 80s if not sooner) don't actually see new colors: they just see purple further to the right in a spectrum, in an area where the rest of us see nothing. Perhaps if one's lenses were removed *early* enough, while the brain has the flexibility to adapt ... who knows? IIRC this ability was used in WW II to communicate across the Dover-Calais straight by blinking a strong UV light in Morse code at night; the light was just perceptible 30 km away by a UV-seeing person on the other shore. -- John Cowan <jcowan@...> I amar prestar aen, han mathon ne nen, han mathon ne chae, a han noston ne 'wilith. --Galadriel, _LOTR:FOTR_