If I understand you correctly, the effect is called fisheye, and its a byproduct of how most games render and is thus not fixable, you can reduce it by changing the FOV but normally you should be focusing on the centre monitor and not the edges. If you are focusing on the centre monitor so long as the effect isn't to extrema then you won't notice it.
We used to have a FAQ on it but I'm not sure where it is now, so google Fisheye effect and you'll be able to find more information on it.
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