![]() "We're often contacted by people affected by moving images on screens, but people are affected in different ways - what's a problem for one person may not be for another," explained Natasha Harrington-Benton, director of the Ménière's Society, a UK charity for peopel with disorders causing dizziness or balance disorders. The problem for those suffering is twofold: first, many other people refuse to believe a problem exists secondly, there's no fix. Matt Gemmell, an independent iOS developer, thought it made sense that those with such conditions "would find some parts of the new iOS 7 interface uncomfortable or disorienting," because it "makes more extensive use of animations - and those animations are more pronounced". ![]() Similar symptoms can also arise from neurological conditions that cause central dizziness. An estimated 69 million US adults aged 40 and over - 35% of all Americans - experience vestibular system dysfunction." Dizzying change Ryan says: "These symptoms manifest even more severely if a viewer already has a disorder of the vestibular system. But prevalence may be much higher in some clinical grpoups with vestibular disease." Golding says that "visually induced motion sickness" has "affected a relatively small proportion" - less than 5% - of the population, compared with other stimuli such as from boats (sea sickness), cars/coaches (car sickness), etc. John Golding, professor of applied psychology at the University of Westminster, says visually-induced motion-sickness often arises from "the induction of perceived self-motion while at the same time the vestibular system and somatosensory systems signal that the body is in fact static". But when the vestibular system and visual system come into conflict, the effect can be distressing. The vestibular system is what gives us our sense of balance and sense of spatial awareness it's dependent on three mutually orthogonal fluid-filled canals in the inner ear. She added symptoms "manifest more severely if a viewer already has a disorder of the vestibular system". Cynthia Ryan, executive director of the Vestibular Disorders Association, says 3D effects can cause "intense nausea, dizziness and vertigo", sometimes from general vision problems, but also from visual-vestibular conflict. Reactions to screen-based systems - especially those utilising 3D effects - aren't new. A number of affected users have reportedly switched iPhones that had already been upgraded to iOS 7 for models running iOS 6. The severity of the jump from iOS 6 to iOS 7 means some organisations dealing with such motion-sickness problems are recommending that people with such conditions don't upgrade their iOS devices. The same minimal effect is true of stock Android and Windows Phone, which lack triggering animations and effects as dynamic and aggressive as those in iOS 7. That system wasn't devoid of triggers (full-screen slide transitions being fairly common), but zooming was minimal and parallax was absent, as were gamified animation effects such as subtly shifting and sliding balloons in Messages.
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