It Worked

The app is very easy to use with imbedded instructions. I took four pictures and averaged the measurements which were very close. I wont know the true accuracy until I purchase new glasses. One glitch was instructions said to enlarge photo and zoom in to eyes for better accuracy. However iOS 9.3 on iPad would not allow me to zoom in further.

My professionally measured PD was 70mm, but the app was fairly close, 65mm. This was much better than a free app which gave me 42mm. I did not notice any differences with the glasses I purchased having 70mm & 65mm PD measurements.

Just a Diner about Pupil Distance PD Measure, v1.1