I'm not sure of the exact degree, but these are for when my eyesight was quite bad. The ones in the back were made several years ago, and the ones in the front were made a year ago. (My contact lens prescription was eventually around -7.0, with a difference between my left and right eyes, and astigmatism.) I'm getting rid of them because I had ICL surgery and no longer need them. The glasses themselves are in good condition.