Well, this is difficult to draw many conclusions from when not knowing
exactly what kind of colorblindness, but..
As far as I know, if you really can't tell the difference between
those blues and reds, then you have a rather rare form of
colorblindness of either monochramacy or Dichromacy
http://www.colour-blindness.com/general/prevalence/

However, there is a lot of details there. For instance, were some of
the links visited ? They have a different shade, and that might well
influence their distinguishability. Also with several of these
colorblindness forms it might also be difficult to distinguish blue OR
red links from the black text (in that case he might have interpreted
and communicated his problem incorrectly)

You can try yourself with something like this palette comparator:
http://www.iamcal.com/toys/colors/

In general when you have two colors like these, they should have
differences in contrast, that almost always works even for colorblind
people. Over all, there are limits to what you can do however.
Changing the contrast might be disadvantageous for users with 'full
sight' for instance. You can't 'defensively' code against all types of
disabilities in the world, it would give you a very ugly website.

A few times, I have considered adding an "accessibility" pane or a
link to a special page, that would allow you to set different skins,
font size, underlined links and other readability aspects of the code.
Such a pane could include settings for color filters for the different
types of color blindness that apply to the entire window (much like
your Operating System can have screen filters for this in it's
accessibility pane). I've never had the time to actually build it
though.

DJ

On Tue, Sep 9, 2014 at 1:55 PM, Amir E. Aharoni
<amir.aharoni@mail.huji.ac.il> wrote:
> Hi,
>
> Disclaimer: Though I worked in an accessibility software company for three
> years, I know almost nothing about color blindness, so this question may be
> silly.
>
> A participant in a recent workshop for new Wikipedia editors workshop in
> Israel complained that he cannot tell red links from blue links because he
> is color-blind.
>
> Has this issue ever been noticed or addressed by anybody?
>
> The only related thing I can think of is the option to show links to
> nonexistent pages with a question mark, which was disabled on Wikimedia
> sites a year or two ago. Is there anything else?
>
> Thanks.
>
> --
> Amir Elisha Aharoni · אָמִיר אֱלִישָׁע אַהֲרוֹנִי
> http://aharoni.wordpress.com
> ‪“We're living in pieces,
> I want to live in peace.” – T. Moore‬
>

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