Not accurate

I am a Master Ophthalmic Optician. I measure PDs every day. My personal PD is 69.0 mm. However after measuring multiple times on this app, it tells me my PD is 57.0. 12 mm of inaccuracy will create a tremendous amount of unwanted induced prism. This is not good! Find a better way to obtain your PD!

Master Optician about Pupil Distance PD Measure