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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 21:47:10 GMT
Xref: news.duke.edu rec.arts.int-fiction:100343 rec.games.int-fiction:68961

"Lewis Raszewski" <rraszews@hotmail.com> wrote in message
news:3C740DB0.7795E89C@hotmail.com...
> Now, bvefore this thread, I had never heard of blue/violet
> colorblindness before. I was under the impression that the major color
> defficiencies were red-green and blue-yellow, corresponding to the way
> color receptors are paired in the eye.

There are blue/violet sensitive cones that are responsible for
distinguishing blue from magenta and suchlike.  At least, that's what the
optometrist told me.  IIRC, there are red/green sensitive cones, blue/violet
sensitive cones, and yellow/green/something-else-possibly sensitive cones.
I can't remember the third, but it's the set that work in my eye.

Hmm...  Some Googling reveals references to blue/yellow deficiency, which
would be the third type then because I can easily distinguish the two -- I
see 'yellow', 'blue' and 'dark' in general.  So in that case the impossible
problem I referred to would be one of the colour blindnesses.

Here's an interesting set of tests:
http://www.umds.ac.uk/physiology/daveb/brainday/colourblindness/cblind.htm

For the most part, I can't see any numerals in the first set (slight curves
that could be part of the red-green deficient results at times).  With the
wavy lines, I can see the first purple one and none after that.  According
to:

http://www.islanddiscs.freeserve.co.uk/access/colour.htm

I have deuteranomaly and extreme protanopia, the latter of which my
optometrist has always called a colour blindness (it's the extreme bit,
where red shows up as black/grey that counts there I guess).

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


