Regarding the eyeglasses, you will set up the focus of the adjustable loupe for one spot of your glasses, likely infinity, which for practical purposes is the top half. If you use the bottom half of your glasses because the camera is at a short height for example, the ground glass and image will never be sharp but the sharpest is the correct camera focus and if you get that then move your head to use the infinity spot of your glasses, you will find it is spot on. Sharpest is sharpest and your glasses are beyond the film plane and do not alter the correct camera focus. (although it is much more pleasing and reassuring when you are using the correct part of the glasses)
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