Just don't watch the YouTube videos on how it's done, until afterwards.

For the first time ever I could drive without wearing glasses.  (Except, of course, sunglasses in the daytime Arizona sun.)  I can clearly see the signs on the Safeway two blocks away.  But I now need reading glasses for reading and computer work.  Should I have paid extra for the better lenses, that come with no guarantee that they will let you avoid glasses?  I'll never know.