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http://forums.steampowered.com/forums/showthread.php?t=602870FPS Nausea and Field of View
As most people know, motion sickness (for those that are effected by it) is caused by a conflict of sensory input between the inner ears and the eyes.
For example, on a large boat everything around you appears to be stationary, but the fluid in your inner ear is telling your brain you're moving. This conflict is the source of the nausea. Conversely, in FPS games your eyes are telling your brain you are moving, but obviously you're not and the fluid in your inner ear is stable. Again the conflict of sensory input.
I have no idea why some people are move sensitive to it that others (nor what happens if you play an FPS game on a cruise ship), but it is definitely a problem for some people and I've seen it first hand. However I do believe that these people are less sensitive to rotational movement (mlook, as it is duplicated by your eye) than translational movement (strafing, as in bobbing on the ship)
Now, for how this relates to an FOV discussion consider this graphical depiction of various view angles:
http://img297.imageshack.us/my.php?i...parisonas7.jpg
As you can see from the normalized views, the apparent center of rotation is 30% further away than 90º for a given screen size, and almost twice as far as 110º.
Now think about that for a minute. If you are accustomed to higher FOVs, your eyes are adapted to that given center of rotation, and you are comfortable with it. Playing at a lower FOV moves this rotaion point up to twice as far from the screen as you are accustomed too. You are no longer at the apparent center of rotation.
The net result of not being at the center of rotation adds a translational component to what you are expecting to be purely rotational. This translation provides a not previously seen (at FOVs you are calibrated to) movement that is again in conflict with the data from your inner ear.
I believe that this is why some people get sick only in low FOV games.
To alleviate it (or general FPS nausea), there's a number of things you can do:
1. Do not play in a dark room. Provide additional data to your eyes that tells your brain you are not moving. Stable objects in your field of view are what you need.
2. Sit further away. This goes along with #1. in the sense you are reducing the amount of area your eyes see as motion. Additionally, it helps to put you back at the apparent rotation of the reduced FOV.
3. Play more. Your brain will eventually train up to the reduced view, but I would suspect going back to a normal FOV could have the same problem again.
4. Dramamine. Yes it works. Any medication intended to reduce motion sickness on boats and the like will work here. It will also help you do more of #3.
Anyways, sorry for the ridiculously long post, but I feel this is an important topic that is continuously overlooked. It is a real problem for some people. Some of which really enjoy (or try) these types of games. I wish Valve and other developers would consider this issue before cheat protecting any field of view changes or not allowing it to be adjusted at all.
I hope if you got this far it was worth your time, thank you.
Este é o unico jogo em que me acontece isso,jogava 5 minutos e ficava a ver estrelas o resto do dia.nunca mais lhe toquei.