Two observations. It's my understanding that sans serif fonts are much harder for dyslexics to read (ironically, one dyslexia example, "DON'T DO THIS" was the only text done with a serif font). Color blindness isn't even mentioned -- people sometimes understand that some pastels are indistinguishable to someone who is color blind, but rarely does anyone think, for example, that red and black might be indistinguishable as well.