![]() ![]() ![]() Start with your glasses on and focus on an object about 20 feet from where you are sitting or standing.Īs you are staring, reach up with the marker and make a tiny mark where the object appears in your right spectacle lens. If you are looking to purchase a second pair of glasses online but are not sure what your PD measurement is, you can easily find this from your existing glasses with the help of a felt-tip marker and your millimeter ruler. You may want to repeat these steps a few times to ensure you have collected the most accurate PD measurement for your new glasses. If you are farsighted, or are measuring for reading glasses, you’ll need to subtract 3 mm. Without moving the ruler, close the left eye and record the measurement from your ruler's zero to the right pupil. Stand about 8 inches from a mirror, holding the ruler just above your eyes and flat against your brow.Ĭlose your right eye, and align the ruler's zero to the centre of your left eye. All you need is a millimeter ruler and a mirror. Let’s say you have your eyeglass prescription and want to buy a stylish pair of wire frame glasses online. Your optometrist or dispensing optician typically measures PD as part of your eye exam using a pupillary distance ruler or a corneal reflex pupillometer, calibrated specifically to each eye. PD is especially critical when fitting glasses with progressive lenses, which requires precise lens-to-pupil alignment to ensure comfortable vision at all distances. Mono PD is believed to be the most accurate since many people may find their nose-to-pupil measurement is not equidistant on both sides. Mono PD is the measurement from your nose bridge to each eye. There are two primary methods for PD measurement: Binocular PD and mono PD.īinocular PD is the measurement from pupil to pupil between each eye. ![]() The average pupillary distance for an adult is about 63 mm, but this is not a number you’ll want to guesstimate.Īfter all, measurement can vary widely - between 51 mm and 74.5 mm for women and 53 mm and 77 mm for men, according to military-recorded measurements. Having your PD handy is just as essential as your prescription when it comes to ordering a new pair of eyeglasses or prescription sunglasses online. Your pupillary distance (PD) - the distance between your pupils - determines comfort and how well your glasses fit. If you’ve ever tried on a pair of glasses and experienced (ouch!) instant eye strain, the reason could lie right between your eyes, meaning your pupillary distance could have been measured incorrectly. ![]()
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