Not to downplay these people's problems, but I found this post from 2013 (in a thread discussing these issues in iOS 7) interesting: https://discussions.apple.

Not to downplay these people's problems, but I found this post from 2013 (in a thread discussing these issues in iOS 7) interesting: https://discussions.apple.com/message/23184178#message23184178 https://discussions.apple.com/message/23184178#message231841... "Motion sickness and dizziness are relatively common in the human population and statistics show that some 20% of population is affected. The two major causes are inner ear and/or visual oculor motor system. People experiencing motion sickness in front of a small screen like a smartphone will also likely have same or bigger symptoms during other life situations: elevators, roofs, boats, reading in a car, watching a movie with a fast moving object, watching kids while they have fun in a carousel, etc. Other related symptoms might be photophobia (excess light sensitivity) causing to use sunglasses even in cloudy days, making a rapid head movement, difficulties in evaluating distances for example while parking a car, etc. Unfortunately it is not a specific technology, it is the inability of some people to meet the requirements of some environment situations. I would suggest to investigate with a clinical evaluation by an otorhinolaryngologist (specialized in vestibular disorders) and an optometrist (specialized in vision therapy). I have seen and treated a huge number of people with motion sickness disorders and the treatment is relatively easy allowing a more enjoyable life not just watching a smartphone screen but also in many other life situations."