"the" screen: The screen on your phone, or another screen (two devices simultaneously)? What is your head position when you are doing these things? Can't answer your question but if/when you talk to someone you'll want to be clear about the specific postural circumstances that relate to your question.
Answered 4/1/2015
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A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
3 doctors weighed in across 2 answers
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