So, I am color impaired. I cannot differ from some colors that look similar.

I am not alone. I've heard from many who have problems seeing the circles in the Shiva fight, even people that are NOT color impaired.

For me it is so bad that I almost cannot see them at all, making it nearly impossible for me to know what to do, or where to go. I usually ask a player to mark him/herself so I can follow, which has worked a few times. - However, nobody should have to do this, so... either change the color of the arena, or change the color of the circles.