Hello , if I take off my glasses occasionally during the week , can I still wear them on shabbos without an eruv or is not a levush anymore?
Glasses remain a levush even if you take them off occasionally during the week. They are “part of your wardrobe” and therefore they can be worn on Shabbos.
Although the Sages did decree that items that are sometimes taken off (such as jewelry) should not be worn in the public domain, this does not apply on a personal basis, and since it is not the normal way to take off glasses (for short sight) in the public domain, the decree will not apply to them (see Shemiras Shabbos 18:11, concerning all items that help the body function).
Of course, you have to be careful not to carry your glasses in an area without an eruv.