Weird issue with contacts and League of Legends?

This is probably something I should speak to my optometrist about but I've been wearing contacts for about a month now, I've used glasses since I was 8, im now 20. While they've been something to get used to I thoroughly enjoy using my contacts over wearing glasses, especially while playing video games and using headsets. However, I've noticed that most prominently whenever a teamfight breaks out if I am wearing contacts my vision starts to blur heavily particularly in my left eye. Has anyone else experienced anything similar? I've read online that blurry vision with contacts can occur especially when you first begin to wear them but its been over a month now and I'm still experiencing this, it only seems to happen with League of Legends and no other games. Any information is appreciated.