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USEFUL INFORMATION
Find your Frames Measure Pupillary Distance Workplace Services FAQs
HOW TO MEASURE
PUPILLARY
DISTANCE
(PD)
What is PD?
Your Pupillary Distance, or PD, is the distance in millimetres (mm) between the centre of one pupil to the centre of the other. A personalised fit starts with measuring your pupillary distance: it indicates which part of the lens you look through, ensuring optimal comfort and clarity.
Why is it important?
If your PD isn’t right, it can cause eye strain, fatigue or simply not being able to see properly. The higher your prescription, the bigger the effect an incorrect PD can have. So get measuring!
WHAT IS SINGLE VS DUAL PUPILLARY DISTANCE?
Single PD
SINGLE PD is the pupillary distance between the centre of one pupil to the other, which can be a distance PD or near PD. Distance PD can be used to order any type of prescription glasses except reading glasses. Read below to learn how to calculate near PD for reading glasses.
Dual PD
DUAL PD, or monocular PD, consists of two numbers and is the distance between the centres of each pupil to the bridge of the nose. Dual PD is usually written in the following notation: 32/30. The first number is always the right eye (OD) measurement, and the second number is the left eye (OS).
FREQUENTLY ASKED
QUESTIONS
Knowing your Pupillary Distance is a requirement when buying glasses. Opthy allows you to determine your PD or verify existing measurements to proceed smoothly with your online purchase. Don’t need glasses right now? No problem - you can still keep track of your PD value for future needs.
No, your PD value is not available directly on your current glasses.
If you ever had an eye exam, the value could be found on your prescription, but it is not always provided there.
If you ever had an eye exam, the value could be found on your prescription, but it is not always provided there.
Opthy operates within a specific range of PD values to give an optimal and personalised experience consistent with the best standards in the industry.
With the current version of the application, Opthy only measures your Far Pupillary Distance.
Stay tuned for further developments.
Stay tuned for further developments.
Opthy is intended for single vision lenses within a certain prescription strength range (+/- 5 diopters). It is not compatible with higher-powered prescriptions, bifocals, progressives or multifocal.
Not intended for use by people under the age of 18.
Not intended for use by people under the age of 18.