We gotta app for that

Optician is always keen to try out the latest gizmos and so we signed up to one of the latest iPhone apps designed to measure your PD. While this might look like someone playing Botticelli or doing a very poor Adolf Hitler impression it is in fact the way the app works.

What the person being measured has to do is hold a credit card, with the black strip outermost and under their nose, in front of the iPhone being held by the measurer. The measurer has to hold the iPhone exactly 30cms from the face of the person being measured press the button and and hey presto, you get a PD of 86mm! I think not. The last time the clinical editor was let loose with a ruler the same PD was measured as 65mm.