Pupillary distance is an essential measurement. It is the distance from the centre of one pupil to the centre of the other pupil measured in mm (ranges from 50 to 70mm). Each spectacle lens will have an ‘optical centre’, this is a point on the lens where it performs the best and has the least distortion. The optical centre of each lens should be placed directly in front of the centre of each of your pupils. That way, your eyes are looking through the best point on each lens. If the p.d for the glasses is not set correctly then your eyes may have to strain to look through them, this can lead to headaches, eyestrain, visual distortion and in severe cases, double vision.

The p.d has to be measured during a sight test, but is not routinely written on a prescription, you can ask for this from your Opticians, or ask them to add it to your prescription when you are tested.

If you experience difficulty in obtaining this measurement we can take it, if necessary, from an existing pair of your glasses.

We will not use average figures for this, because of its importance, so we cannot proceed with a reglaze without it.