Some apple users are reporting sickness and dizziness using their iphones and ipads since they upgraded to ios7. A couple of links here talking about it
IOS7 Motion Sickness: Users Complain Of Motion Sickness While Using Updated IPhones And IPads
iPhone and iPad users report severe motion sickness while using iOS 7 | The Verge
Typical of apple to not allow users to chose if they want to turn the graphics options on or off.
and just decide for you that you will have it on