Macbook Pro Display blurry

Yes I have a 2.4 Intel Macbook pro 15 inch, I know it's a little old but it still works pretty well. My problem is the screen in Mac 10.8.2 is blurry. It's been burry I think every since I installed 10.7. I am thinking the video card is going bad but I am running Windows 7 in bootcamp and the screen is totally clear. I hate running Windows 7, I'm a mac guy but for some reason everytime I go into 10.8 it's like my eyes start to hurt because I think it's blurry or out of focus for some reason. I don't really understand how or why. Does anyone had this happen or know something I can do? I am using Windows 7 pretty much full time now because of this issue but I don't really enjoy having my mac run Windows.