What is my reading PD and can I get it from the MyReaderNumber app?

Reading PD is the pupillary distance needed to properly set the lenses for a pair of multifocal lenses (bifocal, trifocal, progressive, etc.). The MyReaderNumber app cannot provide this number for you, but you can obtain it using the PDCheck along with the PDCheck App or using the PDCheck AR application. The PDCheck AR app is only available on the iOS (iPhones) platform.