Can Color-Blind Users See Your Site?

I actually have a combination of the three through a very rare form of color blindness, in which I am deficient in the amount of cones my eyes have.

The interesting part is that my body / genetics replaced them with rods, so I have very good sight, well above that of the average person.

People always ask me if it is a huge pain, to which I cannot really comment, because it is the only thing I have ever known and the only time it was a frustration was as a child when people did not understand, as well as when I was trying to teach my own son colors and thought that I had a blue items when in fact it was purple.

To the contrary I am quite happy with the condition, as it provided me with a mutation that means I will never wear glasses (i could loose half my vision and still be above average) and no software that I have ever worked on has neglected colorblind users, I am like colorblind accessibility testing built in.

I wonder if there exists a simple tool (css sheet, greasemonkey script) that allows redefining the colors of a to look like the different types of color blindness. It would allow developers to quickly identify issues, and color-blind people to quickly report issues with screenshots.