Measuring Pupil DistanceYou may be lucky, your PD may be noted on your prescription. If not you will need it measuring but when you next go for your eye test maybe ask them to measure it for you for.
The measurement needed is that between the pupils when the eyes are gazing into the distance. If the eyes are looking at something close (including the person carrying out the measurement) the pupils will be slightly closer together.
We recommend the following method.
If you are not confident you have the correct measurement you can send a pair of specs to us, and we can take the pupil distance from those, assuming they have been made accurately.
Does it matter?You will read on the net that an average is fine, or it hardly matters etc, so what is the truth regarding the pupil distance, or PD?
Well it depends on the strength of the prescription, a small prescription with the PD slighly off will be no problem at all for most, but a large prescription a considerable way off will cause a certain degree of strain to the muscles which control the direction of gaze.
The eyes default to looking straight ahead, turning requires effort.
Put simply, if the lenses are not centred correctly then the image in front of your pupil is not heading in straight, so to speak, so the eye needs to turn slighty to align it.
You can not damage your eyes with incorrectly centred lenses, but fatigue may be experienced with headaches and possibly double vision in extreme cases. In short the larger the presription, the more accurate the PD needs to be for comfortable vision.
Varifocal lenses require an accurate PD, they have a channel of clear vision as you move from distance to near and it is important that this is correctly placed.
NOTE if you come across sites which claim to have a formula for measuring PD this is a lie, no such formula exists.
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