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I was reading up about Depth of Focus and wondered if glasses affect depth of focus. If yes, is it noticeable to the user?

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This is very much like the concept of depth of field in photography. The wikipedia article is here. Changing the focal length of the lens changes depth of field, but it is only noticeable for large changes. –  Fingolfin Oct 23 '11 at 5:37
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Depth of focus is most strongly affected by the pupil size--- when the pupil is very constricted, the depth of focus is large, and when the pupil is dilated, it is narrow. The effect is most obvious in the extreme case of a lensless pinhole camera.

The eyeglasses simply change the location of the focal point for a given tension in the eye's lens, and the effect on depth of focus is negligible, I believe.

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Depth of field is related to aperture in a way you can understand with these diagrams. Are common glasses reducing aperture as a diaphragm do, for example, in photography? You can think of the lens in that diagrams as your eye pupil. The frame of your glasses is wider than it, so the limiting element is your eye entrance.

Anyway decreasing aperture will enlage DoF! That is whi pinhole camera pictures focus at every distance. You can try some things looking through a pinhole, as I point out in the link.

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