> -----Original Message-----
> From: Eva-Lise Carlstrom <eva-lise@efn.org>
> To: Virus <virus@lucifer.com>
> Date: 17 czerwca 1998 02:31
> Subject: Re: virus: Hail Virus!
>
> >> Please note, that they cannot be really colour-blind because it would
> make
> >> them blind absolutely.
> >I don't know whether you're talking about the same book (it doesn't really
> >sound as if you are). But it's certainly possible to be color-blind
> >without being blind.
>
> Only if shades are not considered colors. Picture without shades and/or
> colors is just a blank picture would you agree?
Colorblind refers to an imparment in the visual system dealing strictly with
one to three of the three types of cones. If all three types of cones are
impared then no color will be visible, but rods will still identify and encode
brightness. Vision would essentially be in greyscale.
-Paul Prestopnik