According to this article, Apple has released a 92MB update that, among other things, helps iPhone users suffering from motion sickness. However, for some, the most welcome addition will be the 'reduce motion' controls so that the 3D effects and zooming, which are hallmarks of iOS7, can be tailored. When the operating system first launched, Apple's community board became awash with users complaining that the animated effects was making them feel sick.
http://www.hardocp.com/news/2013/10/...ickness_issue/