I was testing a new checkout flow with a friend who has color blindness. They pointed out that my 'Continue' and 'Cancel' buttons were almost the same shade of green. I had just picked colors that looked good to me on my screen. Took me about 20 minutes to redo them with different shapes and a blue for Continue, red for Cancel. Has anyone else had trouble telling action buttons apart after a redesign?
Contrast is important even for people with normal vision, you just don't realize it until someone points it out. Good move adding shapes too, that's a double layer of safety nobody usually thinks about.