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If you are only long sighted or short sighted you shouldn't need to use glasses. You can compensate with the focusser. That's what my wife does. If you have astigmatism you may need to use glasses. Generally the larger the scope's exit pupil the more effect the astigmatism will have.
Exit pupil is the size of the beam of light coming out of the ep. It is can be calculated as either Exit pupil = aperture of scope / magnification OR Exit pupil = focal length of eyepiece / focal ratio of the scope. Focal ratio = focal length of scope / aperture. Don't do calculations in inches. Measure everything in mm.
The problem you are having is nothing to do with the quality of the ep. It's true that the cheapest upgrade you can do now is better eps but wait for a fair while before you do. My recommendation is to make a plan (remembering that one day you -will- get a bigger scope!) for your whole collection and then buy eps as the budget allows. Otherwise you risk winding up with an ep box that looks like the proverbial committee's camel.
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