That's called motion blur and it's part of the game. You can disable it by adding to the "target" area on the shortcut after the .exe path r_motionblur=0
Surround yourself by objects, look forward and turn your head side to side really fast...I just did it multiple times to test it, if your vision isn't blurred. Then I guess you're special.
It's the best part about playing Crysis...the motion blur. It's not like normal motion blur. In Crysis, each object blurs seperately at a different rate or not at all depending on its size and motion/speed..essentially replicating the human eye. Other games just blur the entire screen.
I love the motion blur especially when it's running 40 fps or higher, gives a great visual effect. But of course on the down side it makes the game feel much more slow when it's lagging a bit.