ive been working with eyeglass for ten years , actualy going to college now to have my optician license ! if you want a quick adaptation , DONT alternate between youre old glasses and youre new one. you will have to adapt you're head movement to !for exemple, going down a set of stairs lower you're head and not you're eyes . keep in mind that compared to a single vision lense you're prescription is not spread out in the whole lense , they are a lot of different progressive lens out there and depending on the store you went to , lots of them start you of with cheep crap just to make an extra dollar ! they are a few question an optician should ask when you purchase progressive , the most important one is what do you intend to use them for mostly : are you a light reader , do you spend lot of time on the computer , do you work in an office where you will be reading a lot etc , as i said there is a lot of different lens out there ! not that i want to advertise for a company but one of best lens out there is NIKON , they are definitely worth the difference in price ! another factor is , the care given by you're optician as mesurment are VERY important in fitting a customer with progressive ! if you have different question , dont hesitate to pm me !!! have a good day