Two weeks of feeling queasy, attempting to focus while trying to point my nose walking up and downstairs, with a headache was enough for me. I wont even mention driving, feeling like I couldn't see anything in my side vision. Bleck! My Dr. said to try them for 30 days and she would pay for new lenses...I said ..."Um, no thank you, this prescription is dangerous/wrong and I'm not wearing them." She did replace the lenses free of charge, but we are both less than happy campers.