Nearly 10% of men are colorblind, though not all red/green. It is by far the most common type though, and I'm red/green colorblind. A common misconception is that reds and greens are indistinguishable to people like me. That's not really the case.
Most reds look red and most greens look green. It's just that some particular shades of each are ambiguous. For me, the reds and greens produced by displays tend to be tougher to distinguish than natural hues, but the shades in the Stack Exchange question are as different as can be. It's tough to explain. It's also so subtle that many people with my particular type of colorblindness live and die without ever knowing the difference.
I only learned I was colorblind after being explicitly tested for it in 6th grade. I was pretty surprised! Though it did explain how I always seemed to mess up school assignments that involved coloring maps.
Most reds look red and most greens look green. It's just that some particular shades of each are ambiguous. For me, the reds and greens produced by displays tend to be tougher to distinguish than natural hues, but the shades in the Stack Exchange question are as different as can be. It's tough to explain. It's also so subtle that many people with my particular type of colorblindness live and die without ever knowing the difference.
I only learned I was colorblind after being explicitly tested for it in 6th grade. I was pretty surprised! Though it did explain how I always seemed to mess up school assignments that involved coloring maps.