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Yagon,
That depends entirely on whether you have astigmatism and how bad it is, in addition to how old you are. If you are just farsighted or nearsighted without astigmatism then you can remove your glasses and adjust the optical correction with the focuser itself. If you have astigmatism its severity is the major factor in how it will affect your observing without glasses. My astigmatism correction is -.75 diopters in my observing eye and I can observe without glasses using eyepieces that create an exit pupil under about 3mm. When the eyepiece used creates an exit pupil larger than 3mm the views deteriorate and the further away from the optical axis you go and the larger the exit pupil the worse they get. With long focal length eyepieces like my 27mm TV Panoptic creating a 5.4mm exit pupil, all of the stars in the entire FOV are all distorted to some degree and I don't even consider using this eyepiece without my glasses on. At the other end of the scale, namely my short focal length HD orthos, these all create small exit pupils and I have no problems using them without glasses.
May I ask how old you are and what your optical prescription is in your observing eye?
CS-John B
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