How To Measure Your PD to Order Glasses Online.
Lets first of all start by explaining exactly what your PD is and why this is important.
Your PD or Pupillary distance is simply a measurement from the centre of one pupil to the centre of the other pupil, usually in mm as demonstrated below.
A pupillary distance (PD) is important for correctly made glasses because it makes sure your pupils are lined up correctly with the centres of your prescription lenses.
If not this can lead to possible double vision or diplopia, it can also cause headaches or tiredness and eyestrain.
Will my Optician give me my PD measurement? you can ask but I have found it is very rare for your Optician to give you this measurement because this allows you to go and buy glasses on the Internet potentially saving a lot of money, it also cuts him out of the deal.
Ways to measure your PD:-
In our practice this is done by using a simple PD ruler, not something you will have lying around at home.
You can use a credit card very easily, have somebody take a photo of you with a credit card on your forehead, a simple ruler can also be used for this method, email this photo to your online supplier and we can work the rest out for you.
The alternative way to measure your PD would be to use a simple app, these are available to download from the App store or Google play.
The App that you download you will then take a photgraph of your eyes using your phones camera, the app will then provide an accurate measurement for you.
Good apps availble are, Eyemeasue, Glasseson, Opthy or Glassifyme.
When we supply our varifocal lenses we do this slightly different, we not only need your PD but also where your eyes sit in relation to the frame.
To achieve this we will send you the empty frame for a photograph, with full instructions, simply email the photo and we will work this out for you.
Alternatively any problems simply contact Mark and he will be able to help.