The doctor that wrote your prescription can provide you your PD (Pupillary Distance) over the phone. If not, there are a few ways to get your PD. Please click the link below to get further information about how to measure your pupil distance:
https://www.allaboutvision.com/eye-care/measure-pupillary-distance/
Additionally, if you are sending us glasses that were yours and worked well for you, we can read the pupil distance in the existing lens if you make a note asking us to do that for you.