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From: "Ben A L Jemmett" <bal.jemmett@ukonline.co.uk>
Subject: Re: Colour DEFICIENCY  was Re: Full color Text Adventures?
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Date: Wed, 20 Feb 2002 14:22:42 GMT
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"Lewis Raszewski" <rraszews@hotmail.com> wrote in message
news:3C71AA35.19C3BC4@hotmail.com...
> Ian Trider wrote:
> > [I] just thought that [colour blindness] was a misnomer.
> It is, basically. Almost no one is totally colorblind by birth (I had a
> science teacher whos vision was totally monochromatic, but that was as a
> result of injury), but the term is Medically Okay to describe persons
> with color deficiencies.

There are six possible problems with colour vision; red/green, blue/violet
and another (green, I think) deficiency and the three associated blindness.
One of these is impossible -- I think it's blue/violet colour blindness.
Each has its own medical term.  The blindnesses are pretty rare, since it's
a complete failure of one set of cones rather than a reduced sensitivity
AIUI.  Which probably means that I have somewhat insensitive blue/violet
cones, broken red/green ones and normal ones for the other sensitivity
(again, green I think).  That'd fit with my perception of things I guess.

There's a chapter on this in the first volume of The Feynman Lectures, but
last time I read that I was in hospital after my corneal graft went through
some nastyness which makes it about a year ago.

--
Regards,
Ben A L Jemmett.
(http://web.ukonline.co.uk/ben.jemmett/, http://www.deltasoft.com/)


