It's a mistake :-) http://www.daniellivingston.com/2012/06/measuring-your-own-pupillary-distance.html?showComment=1379031016351#c8557027083848845892 http://www

It's a mistake :-) http://www.daniellivingston.com/2012/06/measuring-your-own-pupillary-distance.html?showComment=1379031016351#c8557027083848845892 http://www.daniellivingston.com/2012/06/measuring-your-own-p... AnonymousSeptember 12, 2013 at 1:02 PM It measured me from a 61mm to 65mm PD. So call it accurate within ±4mm. Uh, no... This is ±2mm (around a center value of 63) Daniel LivingstonSeptember 12, 2013 at 6:10 PM Oh yes that's true, I meant to explain it is inaccurate by up to 4mm.