I noticed that visual confusion tends to give me headaches (I often get them in stores, for example), and that blocking off my peripheral vision by wearing a hood helps. So I bought glasses with thick stems, to make my field of vision smaller all the time.
I'm nearsighted enough that all I use my peripheral vision for is seeing whether there is movement behind me (which I can still do - the glasses only cover the middle part), so the only cost was restricting my choice of frames to styles with thick stems. Anything that prevents headaches is a productivity boost for me, because I tend to procrastinate and loose focus a lot more when uncomfortable.
I'm not sure whether it actually worked - stress and changes in the weather cause so much noise that it would be hard to measure. If my stress level ever gets more consistent, I might try making something even wider that fits over the stems and experimenting with that.
Are you sure it's a matter of "visual confusion" and not having a lot of stuff clamoring for your attention but being blurry because it's outside the radius of your glasses? I definitely noticed things were better visually for me when I switched to contact lenses and lost the blur-circle that existed around the edges of my vision all the time.
Thus spake Eliezer:
It seems that many here might have outlandish ideas for ways of improving our lives. For instance, a recent post advocated installing really bright lights as a way to boost alertness and productivity. We should not adopt such hacks into our dogma until we're pretty sure they work; however, one way of knowing whether a crazy idea works is to try implementing it, and you may have more ideas than you're planning to implement.
So: please post all such lifehack ideas! Even if you haven't tried them, even if they seem unlikely to work. Post them separately, unless some other way would be more appropriate. If you've tried some idea and it hasn't worked, it would be useful to post that too.