Why low FOV in first person games can make you nauseous?

The FOV slider is the most important graphics option in gaming by at least one metric: It can literally keep a game from making you feel sick.

In 2006, I had more headaches from The Elder Scrolls 4: Oblivion than from studying for school exams. I played Oblivion day after day, but not on a PC: I was stuck on an Xbox 360, which was shiny new but barely capable of running Bethesda’s new RPG. Every hour-long play session gave me a dull headache, which I simply attributed to too much Oblivion. It wasn’t until years later that I found online forum threads with people complaining about the same thing, blaming Oblivion’s particularly narrow field of view, or FOV, for giving them headaches or even nausea.

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