I decided to play a game of Evelynn on the PBE and after just 1 game, my eyes were hurting and I had a headache.
There were 2 issues:
1: The screen turns very purple when you're stealthed now.
May not seem like much, but when your screen is like this for 80% of the game it is actually extremely annoying on the eyes, to the point that I was legitimately considering AFKing just to stop staring at the screen. It was like playing on a broken monitor with one of the colors not working. I was using skills when I didn't need to just to "fix" the broken monitor.
PLEASE PLEASE PLEASE tone down the effect, I would actually quit Evelynn who I've mained for 4 years if this goes to live.
2: Not a big deal, but thought I'd mention it, there's a bug that makes your passive activate when dead, which also causes the red/yellow eyes to appear above enemies' heads and the purple screen tint. Not a big deal, but somewhat distracting and clearly unintended.