How to Measure Your PD (Pupillary Distance) Updated With Selectspecs.com


the pd or pupillary distance is a distance between the center of your pupils and millimeters this measurement ensures that your prescription lenses are correctly centered in front of your eyes when purchasing new glasses this measurement is especially important for people with higher prescriptions your PD is not always given as part of your prescription when you have an eye exam you should ask your optician for your PD measurement however the optician testing your eyes is under no obligation to provide it or there may be a small fee thankfully you can measure your PD yourself with the help of a friend or a family member there are two types of PD measurement one for distance and one for reading the distance pd measurement is used for distance intermedia bifocal or varifocal glasses the reading PD measurement will be used only for reading glasses the PD rule is designed to fit over the bridge of your nose with sections cut out for your eyes to look through with the help of another person sit opposite each other about an arm’s distance apart your helper should hold the pd ruler between their thumb and forefinger resting the ruler on the bridge of your nose and steady their hand by placing their remaining fingers against your head the person taking the measurement should close that right eye and look directly opposite into your right eye make sure you look directly into their open I as you are being measured make a mental note of the measurement from the bridge of the nose to the center of the pupil in millimeters without moving the pd-1 the person taking the measurement should switch their open I closing their left eye and use their open right eye to look into your left eye directly opposite again make sure you look directly into their open I that you are being measured make a mental note of this second measurement from the bridge of the nose to the center of the pupil in millimeters now add these two numbers together to get your PD measurement repeat this process several times until you are happy with the accuracy on your results in general an adult PD measurement will fall somewhere between 55 and seventy two millimeters if you don’t have a PD ruler you can use a standard ruler with millimeter measurements take in the same positions with your help I as before the person taking the measurement should close them right by using their open left eye they look directly into your right eye opposite lining up the zero on the ruler with the center of your pupil make sure you are looking directly ahead into their open I as you are being measured the person taking the measurement should rest the ruler firmly against your forehead to keep it steady without moving the ruler the person taking the measurement should switch that open I closing their left eye and use that open right eye to look into your left eye directly opposite again make sure you look directly into their opaline as you are being measured the measurement at the center of second pupil is your pd measure repeat this process several times until you are happy with the accuracy of your results remember to keep your head perfectly still as you are being measured if you are purchasing reading glasses you’ll need your reading or near pd measurement the principle for measuring a reading pd is almost identical to measuring a normal distance pd the person taking the measurements can simply follow the instructions already mentioned in this video the only difference is that the person being measured should focus on an object closer to their face hold a pen around 30 centimeters directly in front of your face and keep your focus here while your pd is being measured this will cause your eyes to converge slightly giving you a more accurate reading PD measurement we advise against measuring your pd by yourself in the mirror this is because the distance to the mirror surface and your reflection in the mirror can vary dramatically or taking a measurement which may result in the less accurate pd measurement if you are not comfortable or confident enough to measure your pd with some help it is possible to take your measurement from an existing pair of glasses when placing a little of the new glasses you can choose to send your old glasses to us and we can take a measurement from lowes the glasses must include both prescription lenses for a measurements be possible one speedy measurement has been taken from your old glasses we can either return them or donate them to charity once you know your PD measurement you should write it down and keep it with your prescription in the same place unlike your prescription your PD measurement won’t change over time

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