If everything seems bigger with your glasses, that should imply that you are long-sighted (+ve Rx, lenses thicker in the centre). If that isn't so, there is something wrong...
To a certain extent the effect is inevitable, but it shouldn't make glasses unwearable.
Adapting from contacts to glasses and vice-versa can take some time if the prescription is strong... (a few days, a week at most). Try wearing the glasses an hour or two every evening. It shouldn't affect your vision with contacts: the brain will become better at swapping if both the contacts and glasses *are* OK.
Other possibilities:
The glasses are badly fitted.
The magnification effect is worse if the glasses sit further from the face than is necessary, or at the wrong angle, or with the optical centres of the lenses the wrong distance apart.
That should certainly be checked.
Less likely with modern lenses, but to be considered, is the possibility that the contact lenses are affecting the cornea, causing oedema (swelling) so that when they are removed, the cornea is not a good match for the strength of the spectacles. If that is the case, it can take between week and a month without contacts for the corneas to return to the shape they *want* to be.
If it's not down to a very high prescription, or the fit of the glasses, and the prescription is reasonably up-to-date, that last possibility may need checking.
(Optometrist, retired)
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