People are often surprised to find out I cannot see every colour of the rainbow. My eyes do not like certain shades of red/green. This isn't something I think about very often, though, as I can operate in the world just fine. Is this because other designers take colour blindness into consideration, or is it because I've simply not experienced anything different?
When design interfaces for applications and websites, I put a bunch of thought into how the site will look to people with differing visual acuities. This often results in people saying that my designs are "boring", as the primary goal is usability and readability rather than colourfulness. One area where these designs fall down, however, is with people who have very limited vision or are blind. This is something I have very little experience with and should spend more time learning about.