Never had any problems myself thought I get sometimes (well lately a lot) flashes of flickering light behind my eyekids when stresed and trying to sleep which is an anxiety symptom apparently . What are you seeing James?
I had the exact same problem, and when i complained to my pdoc i was told it was a rare side effect. The tried to convince me to stick it out, but I refused and they took me off of it. How are you supposed to drive a car if you never know when ur vision is gonna go screwy? I'd have them take you off of it. Good luck!!