I am apparently slightly gray/green colorblind, at least based on my erstwhile tendency to think that gray things are actually a sort of pale green color. Yes, I learned this on St. Patrick’s Day years ago.

My “color acuity” is reasonably good, though, at least according to the “Online Color Challenge.” I scored a 17 out of 99, with 0 being the best score. According to the test results, the highest score in my age and gender group is 7,999,740, which is a bit higher than 99, where the scale seems to end. Not sure what’s going on there.