OT: Colour-Blindness ( Was: Re: OT-ish:Conlang Census)

I wrote:

<<< Well, I _think_ my favourite colour is blue...but
> various eye doctors have assured me that I am
> colour-blind and only see shades of gray.>>>
Mark J. Reed responded:

<<<Er?  The term "color-blindness" does not mean you
only see shades of grey; seeing no color at all is
practically unheard of in humans.  A person who is
color-blind - such as my mother-in-law (although it's
very rare in women) and brother-in-law - just cant
distinguish certain sets of colors.  In their case,
red and green - other things being equal - are
completely indistinguishable, with a cascade of
implications for other colors which include those as a
component.  Such red/green color-blindness is by far
the most common form, but there are others, such as
blue/yellow - which you obviously don't have. :)>>>

   Well actually I have an eye condition known as
acromatopsia.  The retina is made up of cells called
rods and cones, but my eyes are missing the cones.  So
I'm colour-blind, really light-sensative, and I have
really bad distance vision.  All the people who have
gotten acromatopsia later in life somehow have
reported only being able to see shades of gray when
they could see colours before so I assume that I see
likewise, but I wouldn't know because I've been
visually impaired since birth.
---Etak

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