I downloaded 3 PD measurement apps. This was the only one that gave a consistent number no matter where I held my phone. For those of you thinking you need to use a credit or debit card to do this, you do not. You can use any standard *credit card sized* card with a magnetic strip on it (line it up with your bank card to make sure it’s the right size). You don’t show the front of the card only the back with the strip. I used my AAA card. It has zero personal information on the back. The instructions are very clear and say use *any* standard sized card with a magnetic strip on it so I’m not sure why anyone is freaking out about having to divulge sensitive personal info because you don’t.

Omg, I did this 10 times in a row, same location, same lighting, everything! 5 of them said 63.0 and 5 of them said 62.5 so which one do I use! HahaReading reviews some people were concerned about information issues or privacy issues! I used my drivers license because my state is one that has the magnetic strip on the back! I guess that I didn’t think much of it when I did it but honestly, all of the information on your drivers license except for the license number is public information anyway! But using the license number is only going to get you the public information anyway! I’m just glad that I didn’t use a credit/debit card! But the developers response to those reviews say that they don’t use that information anyway but if it’s a concern, use your drivers license if your state puts the strip on the back!

To measure, the app requires a magnetic strip card. In most cases, people will use credit cards found in their wallets. By virtue of taking an image of the card, the app collects your credit card information, partially or fully. It is not clear if the images used are deleted or retained, and if the image scanned are used to extract additional information (e.g. name, card number, exp date, institution, etc) beyond distance/scaling measurements. Normally I would think about these issues before using any app, but now I am regretting having used it knowing a picture of my credit card is on their servers.EDIT: the developer policy states the company will make “reasonable efforts” to apply an obfuscation algorithm on the image for details. It is still not clear if the initial raw images are saved somewhere and how good this algorithm is.2nd EDIT: developer response is reassuring.

Thank god for this app!! I saw my optometrist for my annual back in May already knowing that I wanted to order glasses online, as my health insurance coverage is most beneficial to get contacts in office. I thought when the office gave me my eyeglasses script, it would have my PD on it. Apparently that’s an extra type of fitting with a $25 charge 🙄 I Googled and found this app being recommended, so I downloaded it - happily, as it already had 4.9/5 star reviews. I measured my PD a total of five times and took the average of the five results to ensure my PD was as accurate at possible and ¡voila! It was perfect. THANK YOU TO THE CREATORS OF THIS APP!!!