They are your only pair of eyes. Before playing with walmart type glasses, do yourself and your eyes a favor and have them properly tested. If he suggests OTC glasses would work, then get yourself a pair as he describes. But if you're going to be using them all day, aren't your eyes worth the extra cost of a prescription pair. Think self medicating. My eyes changed a lot between 43 and 48. I've been using progressive bifocals for 10 years. They took time to get used to and have been the only bifocals I've used.