How to Measure Your PD - Eye Care at M&S opticians - Eye Care | Brands | M&S Opticians
Pupillary Distance Meter ruler, Measure Optical Ruler Pupil Distance Meter Eye Ophthalmic Tool, Measurable range Total interpupillary distance: 42~82mm, left and right interpupillary distance: 21~41m : Amazon.co.uk: Health & Personal Care