Have you ever noticed when you sit down to play a game, the first 2-3 games look incredible - you can see the entire screen, you see the maximum amount of frame rate your mind will process, and you “feel” better with your movement? Then, after a few rounds that drops off and you’re focused in on the “area of focus” (AOF). For FPS/TPS games, the AOF is usually the diameter of a silver dollar on any average 1920x1080 screen. 2 main things happen in the AOF:
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Diminished peripheral area
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Accommodation and Vergence
ACCOMMODATION AND VERGENCE
Accommodation is the process by which the eye adjusts its focusing distance, while vergence is the simultaneous movement of both eyes in opposite directions to obtain a single binocular vision. Prolonged screen use involves a specific focusing distance, and shifting to look at something off-screen requires a change in accommodation and vergence. This influences your perception of depth. Essentially, the longer you are staring at a screen, the more accustomed your brain becomes to the display distance and the artificial 3D distance inside the game. The screen distance will not change, but the changing perspectives of things on the screen will shift your eyes' focus. This leads to frustration, bad gaming habits and causes some gamers to stop playing altogether. No gaming company wants you to stop, and no gamer really wants to stop.
