I got them for driving in my early 20s because my vision was very slightly below the legal standard (it was good enough that if I were ever tested I could probably pass, but couldn't be entirely sure). About six years later my prescription had shifted very slightly. Eight years after that it had shifted slightly again, and my vision had improved a little. Now I don't wear glasses at all. The last time I did a rough and ready test with the chart on the wall it suggested my vision was better than 20/20. Strange, but that's how it turned out.