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Entirely horizontal touch screens have the same problems as trackpads/keyboard/mice (or piano playing) that they can have in terms of wrist strain/RSIs (including carpal tunnel), and sometimes elbow movement strain/RSIs (including things like "tennis elbow").

Vertical touch screens trade the more traditional wrist/elbow strain/RSIs for other arm/elbow/shoulder strain/RSIs (including things like "gorilla arm").

Given the nature of repetitive stress, the growing consensus seems to be not that one orientation is better than the other, but that a range of orientations, and a mixture of movement types / input methods is better. For instance, move your arm some to touch a vertical screen, to mix things up from mouse movements and keyboard movements.




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