I find that when spending all day taking photographs, having one eye closed so I can focus and compose through the viewfinder, I end up with a nasty headache. I'm not sure if this is because I'm constantly looking through one eye or if it's because I'm squinting and the muscles constantly contracting and relaxing causes the headache?
I'd be interested to read if other people suffer headaches from having one eye closed.
Regards,
Humayun
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