I test my eyes before 2 month.before testing no for right eye (-3.75)and for left(-2.75). its increase by(-0.25)for both.m i need to take new glasses?

Personal preference: There is little difference between -3.75 and -4.00 diopters, and likewise between -2.75 and -3.00 diopters of correction. That means one's glasses should still work fine, but if wanting new glasses, one can have a pair made with the new prescription. Occasionally, a person might end up liking her old prescription better because she's grown used to her old glasses.