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And it's not just a thing for binocular or telescope viewing. When I described it to my sister, before she viewed for the first time, she said that's just what I do when I'm out walking my dog after dark. If I want to see what the dog is doing, I've learnt to look away slightly from the dog and I can more clearly see what is happening from the "corner of my eye".
Also look at 47 Tuc, naked eye, then glance a little away from it. It really jumps out at you then!
As I recall, there are certain directions to glance and they can differ between monocular (telescope eyepiece) and binocular (binoviewer or binoculars). You can also move the image onto your blind spot, if you look the wrong way. You need to experiment. Telescope (monocular) I usually glance towards 2 o'clock.
Remember, also, a moving object can be more readily picked up by the eye. Hence try tapping the scope to make it vibrate. With a dob, it's easy to gently move the OTA a little bit back and forward, up and down - I often do that to confirm I have located the faint fuzzy!
As I understand it, our eyes are evolved for looking directly at brightly objects during daytime and seeing them in colour.
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