Hey blackicile, hope this helps.
In my current site this was not taken into account but for the now performed reconstruction accessibility in general and issues like color blindness have been taken into account.
I think the percentage is one half of that (around 16% of males, may vary on geographical location) but this is just a hunch - I can't remember the facts.
Color blindness doesn't prevent the colour blind person from seeing colors (red, yellow, mainly) - instead the colors blend into the background with varying intensity, depending on the color blindness. Many people are actually unaware if they are partially color blind and it's usually discovered during driving license vision tests, military enlistment tests etc.
Ya. I ramble again. Back to the issue at hand.
Designing for possibly partially color blind audience doesn't actually require that reds and yellows aren't used. What it requires is that contrast between text and background is relatively high (eg. when using light grey background, don't use dark grey text but black instead). Since even colorblind-red will see the contrast, the color doesn't disappear - it fades into the surrounding color.
In a similar manner, slightly deviating from the subject - the site I'm working on has been designed bearing accesibility in mind: page navigation is simple (6 part main menu+side menu of only a couple objects), it's at most <30kb and will load on mobiles, braille etc. quickly but without the css formatting (then again, so will everyone else's). I've yet to implement the key navigation but that too will come.
Last but least, the obvious accesibility issues: caption and headers on tables, title tags on non-main navigational (e.g. none in the main navigation which is mostly repeated on every page) links, links with readily discernible appearance (I use darker color with "hover" effect of underline but may resort even to underlines).
I'll post a review request when the reconstruction is done in a couple weeks.
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