This measurement is used to determine where the centre of the lens is to be positioned in front of your pupil when your prescription glasses are made. European tolerances allow a few mm's each way but SpecsOnTheNet.com have built their reputation on the precision glasses they supply so kindly request our customers adhere to the following guidelines.

It is recommended you ask your optician for your pupillary distance measurement. From time to time your optician will supply this as standard but it is not a legal requirement and therefore a few opticians will choose not to include it when you cause them to suspect that you are going to take your prescription elsewhere by simply asking them for a copy of your prescription. See what they say if you ask for it! Nevertheless it is a simple measurement which can be taken yourself but for best results we suggest asking a colleague to assist.

Simple steps to taking your (P.D.) (O.C) (pupillary distance) (optical centres) measurement

• First remove your glasses!
• Then have your friend sit directly opposite you positioned at eye level.
• Remaining still, have your colleague cover their right eye and position a ruler on the edge of your right pupil.
• Next, have them cover their left eye and record your pupillary distance measurement by measuring to the same on your left pupil.
• REPEAT the above steps to clarify ..........

That's all there is to it - the PD in the above example is 56mm.

By supplying us with your most accurate P.D. measurement will ensure the most accurate prescription glasses are supplied to you. Focusfix VMS users will benefit from receiving the most accurate 'true' presentation of how your new glasses will look before purchase.