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The sore eye problem is usually a problem for people who didn't do stuff like fire air guns or rifles when younger. I did that and haven't had a problem closing one eye all the time. Though I did get an eyepatch, which was supposed to make things better at the telescope, and it drove me nuts.
The advantage of keeping the other eye closed, is that when looking for faint things, and you can't find them with the eye you're using, just use the eye you've kept closed in reserve, as it's likely going to be more sensitive.
Regards,
Renato
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