Epileptic Flickering

when playing any 1.7 version and 1.8 snapshots, there is flickering across the entire window. the flickering always is the same color as the sky. it doesn't go away when looking in different directions. The flickering also occurs in fullscreen. When i enable the fullscreen option, it goes fullscreen into a crazy graphical mess.and is hard to get out of unless i quit minecraft. The Flickering occurs regardless of the current gamemode.