![]() ![]() But don’t worry if they didn’t include it on your glasses prescription – it’s easy to measure PD by yourself. Whenever possible, we recommend getting your PD measurement from your eye care professional. If you don’t know what your PD is, you can measure it by yourself with our quick guide below. It’s important that your PD should be as accurate as possible to make sure you get the clearest and most accurate vision. It indicates the optical centre of your eyes, to make sure that your correction is right in front of your pupils. Your PD ensures that your prescription is properly focused and centred. PD is the distance between the centre of your pupils, measured in millimetres (mm). Without the right PD, you might experience eye strain and headaches because they’re not the right fit for your vision. For the best glasses to fit the distance between your eyes, schedule an eye exam.Before you order a pair of prescription glasses online, it’s essential to have your pupillary distance (or PD) measurement.Īs part of your glasses prescription, PD helps ensure you to see clearly when you put on your new pair of glasses. However, a do-it-yourself pupillary distance calculated with a ruler will not be as accurate as the PD measurement you will get from your eye doctor. You may want to repeat these steps a number of times to ensure the most accurate PD measurement. Take note that if you are farsighted or are measuring for reading glasses, you have to subtract 3 mm. Voila! This distance is now your pupillary distance measurement to make it easier for you to order glasses online. Without moving the ruler, close the left eye and record the distance from your ruler’s zero to the right pupil. Close your right eye, and align the ruler’s zero mark to the center of your left eye. Stand around 8 inches away from a mirror while holding the ruler just above your eyes and flat against your eyebrow. But the good news is that you can measure your own PD in a pinch using only a millimeter ruler and a mirror. Your eye doctor usually measures PD as part of your routine eye exam through a pupillary distance ruler or a corneal reflex pupillometer. PD is essential in fitting glasses with progressive lenses that require precise lens-to-pupil alignment to guarantee a comfortable vision at all distances. Dual PD (Monocular PD) is measured from your nose bridge to each eyeĭual PD is considered to be the most accurate since many people find their nose-to-pupil measurement not equidistant on both sides.Single PD (Binocular PD) is the distance from one pupil to another between each eye.There are two primary methods to measure PD. ![]() Measurements vary widely between 51 mm and 74.5 mm for women and 53 mm and 77 mm for men. ![]() The average pupillary distance for an adult person is approximately 63 mm, but this does not mean you can guesstimate this number. An accurate measurement of PD is just as important as your eyeglasses prescription. Your pupillary distance (PD) is the distance between your pupils that determines the comfort and how well your glasses fit. ![]() The reason behind this is that your pupillary distance could have been measured inaccurately. Have you ever experienced trying on a pair of eyeglasses and you suddenly felt a sting on your eye? This is called an instant eye strain. ![]()
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