Being short sighted, without astigmatism, I much prefer to observe without my glasses. Not only is it more comfortable, but I figure that the less glass in the optical path between infinity and my eyeball the better.
I always have them with me, though, because in any observing session I spend as much time looking up at the sky naked eye than through the eyepiece. So it is a case of, "On again, off again" for me.
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