I still watch tv on an old CRT television but just recently I’ve noticed that when I move my focus to something else in my lounge the picture on my CRT television slightly flickers like a strobe effect in my peripheral vision. However, when I move my eyes back into the TV the picture returns to normal. Is this normal? It’s strange how I’ve just noticed this but I’m thinking it’s because of my anxiety disorder that is making me aware of this. Another strange thing is that this doesn’t happen when watching a modern flat screen LCD TV through my peripheral vision. It just seems to happen with a CRT TV. Please advise.