Even as a non color blind person I have issues with the same part of the fight. It's way easier to see teh red one than the green one and sometimes one of the lines doesn't even appear on my screen. I don't even look for the green one any more and just try to find the red one so I know what to do.

Instead of a line, it should be an aura or the whole mob should be red/green. It would be way easier to tell them apart. There should also be a color blind setting.