If you’re having trouble figuring out your PD you definitely need this app and the glasses. It worked for me. I had my PD checked at the eye doctor but I wanted to test these, as well, in case I ever lost/misplaced my info. Which, I’m notorious for doing. The numbers from the doctor and the app/glasses were identical. I was skeptical this wasn’t going to work at first, but I’m happily surprised that it not only worked but was accurate. So, don’t be discouraged from giving these a try. $12 bucks isn’t a lot and hopefully you will yield the same great results. Thank you eyeque!!!🤓🕶🥸💕