I had that a few years ago with an earlier red-blue 3d system, and it was terrible for 20-30 minutes. I had to lie down.<p>It&#x27;s also known as &quot;Doom-Induced Motion Sickness&quot; or DIMS. (1)<p>Motion sickness in a car or boat is caused by a conflict - the inner ear says &quot;you&#x27;re moving&quot; and the eyes say &quot;you&#x27;re at rest&quot;.<p>With a game, this is reversed - the eyes say &quot;you&#x27;re moving&quot; and the inner ear says &quot;nope!&quot;. This was <i>worse</i>, or at least unfamiliar in a bad way.<p>1)<p><a href="http:&#x2F;&#x2F;www.theguardian.com&#x2F;lifeandstyle&#x2F;2011&#x2F;dec&#x2F;19&#x2F;video-games-makes-me-sick" rel="nofollow">http:&#x2F;&#x2F;www.theguardian.com&#x2F;lifeandstyle&#x2F;2011&#x2F;dec&#x2F;19&#x2F;video-ga...</a><p><a href="http:&#x2F;&#x2F;kotaku.com&#x2F;5869607&#x2F;how-motion-sickness-can-ruin-games-and-the-meds-used-to-fight-it" rel="nofollow">http:&#x2F;&#x2F;kotaku.com&#x2F;5869607&#x2F;how-motion-sickness-can-ruin-games...</a><p><a href="http:&#x2F;&#x2F;www.escapistmagazine.com&#x2F;forums&#x2F;read&#x2F;9.254333-Doom-makes-me-sick-No-its-not-because-of-the-violence" rel="nofollow">http:&#x2F;&#x2F;www.escapistmagazine.com&#x2F;forums&#x2F;read&#x2F;9.254333-Doom-ma...</a>