The new iOS brought several new features to the current and newer models of the Apple iPhone, iPad and iPod. The new design is very cool, with apps floating and easing from side to side over the dynamic wallpaper which pans as you move the phone around, producing three dimensional-like effects. This is also called parallax.
However, following the update, many users have complained of experiencing motion-sickness and even effects of vertigo. Official support forum of Apple has a thread on this issue which has become a venting ground for frustrated users.
One user shares his experience, “The zoom animations everywhere on the new iOS 7 are literally making me nauseous and giving me a headache.  It’s exactly how I used to get car sick if I tried to read in the car. How do I turn them off?  Do I have to revert to 6?”, which 100s of users on the forum seems to share.
Experts on motion sickness say the sharpness of the higher-resolution images and movement of icons is partly to blame, as it visually seems that you are moving, when you are really not, causing dizziness and maybe even nausea, reports
Experts To disable parallax go to Settings, GeneralAccessibility, Reducing Motion and swipe to green, to turn on the reduce motion feature. Disabling this doesn’t completely solve the problem, but would certainly ease it a bit. In addition to the parallax effect, zooming in/out during application switching/transition, adds to the sickening feeling. 
Now I’m feeling a bit dizzy, and I’m gonna stop right here 🙂
By the way, turning on “reduce motion” will help save battery a bit as well.