Shopping for glasses online is easier than ever. All you need is an up to date prescription and you can order any style, any frame from the comfort of your own home and at the click of a mouse. But other than having the measurements for SPHERE, CYL and AXIS for your right eye (O.D) and left eye (O.S), you also need a PD measurement.
The trouble is, not many opticians provide a PD measurement when they print off your prescription so many online shoppers don’t actually have that information to hand. If you’ve tried ordering your specs online before, you will have noticed that there’s