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As users all over the world up­graded to iOS 7, some re­ported that the new OS was mak­ing them ex­pe­ri­ence some­thing they’d never felt from iOS be­fore - nau­sea.

iOS 7 is built on top of a physics and par­ti­cle sim­u­la­tor, and it cer­tainly uses it to full ef­fect; apps zoom in and out when switch­ing, and the wall­pa­per has a par­al­lax ef­fect which moves un­der­neath icons. Ac­cord­ing to doc­tors, this mis­match be­tween what is a sta­tion­ary, flat ob­ject (your iPhone) and a mov­ing, three-di­men­sional rep­re­sen­ta­tion (iOS 7) is what causes peo­ple to feel dizzy, get headaches, or even feel sick.

It’s the same rea­son why peo­ple get sea­sick; when the con­trast be­tween the ship’s move­ment and its sta­bil­ity sends mixed sig­nals to the brain. For­tu­nately, with iOS 7.0.3 you can turn off all mo­tion ef­fects by go­ing to the Set­tings app, then Gen­eral > Ac­ces­si­bil­ity > Re­duce Mo­tion and turn­ing the switch.

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