![]() If the numbers are smaller, this means you have a monocular PD therefore, you have two separate numbers for each eye. … If the first number is higher, like 62/59, then the first number is your Distance PD and the second is your Near PD (for reading-only glasses). ![]() Most adults have a PD between 55-65 millimeters. While 58 is your reading PD which can only be used when you need single vision reading glasses. 61 is your distance PD which can be used when you need single vision distance glasses, bifocal and progressive glasses. For example, if your dual PD is 33/31mm then your near PD would be 31.5/29.5mm. If you are using Dual PD to calculate near PD, then subtract 1.5mm from each eye’s measurement. How do I convert dual PD to single PD?įor example, if your distance PD is 63mm, then your near PD is 60mm. The number that lines up with your left pupil is your PD. Measure the distance from your right to your left pupil. Have your friend hold the ruler up to your right so the zero end lines up with your pupil. How do I find my PD?įace your friend and look straight ahead with both eyes open. The smaller number would be used only when converting the prescription to single vision reading glasses. This would mean that you use 63 as your PD for distance vision. You might be given two numbers such as 63/60. ![]() Most adults have a PD between 53 and 70, and children will be between 41-55. The doctor during your exam does not take your PD at anytime during your exam, as that is left to the optician who is going to make your eyewear. Some offices will put the PD measured by some of the instrumentation during your exam on the prescription and others will have the optician take that measurement for you. However, if you feel the vision blurry or double then your spectacles glasses have the wrong PD. Now move your finger closer to the nose, if you find it easy to focus on the finger without any strain or squinting the eyes, then your prescription glasses are perfect. While staring straight ahead, take a non-permanent marker to mark the center of your pupils on your glasses.Īdvertisement How do you know if your PD is wrong? … With your glasses on, stand 8-10 inches away from a mirror. ![]() If all else fails, you can use your old or current glasses to measure your pupillary distance. Lots of optometrists will give you a copy of your prescription but not include your PD. If your PD is off, the “optical center” of your lenses will be, too, and your glasses won’t be as effective as they should be. If you are getting single vision reading glasses, use your near-vision PD, which is your distance vision PD lowered by 3 mm.” Do you need the glasses primary to correct your near vision or distance vision? Is it okay if my PD is off? “Pupillary Distance (PD) is the measurement from the center of one pupil to the center of the other. Do I use Dist PD or near PD when ordering glasses? During the day, your PD can vary about 3-4 mm depending on your viewing distance. Typically, adult pupillary distances range between 54 to 68 mm and children range from 41 to 55 mm. Your PD is widest when looking far away and progressively narrows as you look at closer objects. For children the measurement usually ranges from 41 to 55 mm. What is the average eye PD?Īn average PD measurement is about 62mm for women and 64mm for men. This is why: Dual PD is believed to be the most accurate since many people have different distances between their nose and pupil on each eye. Single PD is the total distance between the center of both pupils. Another example is if your numbers are 34.5/33.5, then it means your PD was taken one eye at a time. The first number, which is always higher, is for distance, and the second number, which is always lower, is for near-vision reading only. A small margin of error might not cause problems, but it’s better to be as accurate as possible. If your lenses aren’t centered correctly, they can cause discomfort and eye strain. If the PD measured was 2mm off initially, by using a millimeter rule, the net cumulative error might be 4.5mm or more. But if you have two different numbers, you have been measured for Dual PD (also known as monocular PD). Typically, there will only be one number in your PD measurement – this is called Single PD, and it can be used to order most types of prescription eyeglasses. Can you have 2 pupillary distance?ĭual PD. You have a Right Eye (OD) PD and a Left Eye (OS) PD, which can be different and are measured from the center of the nose to each eye independently. The PD, which stands for pupillary distance, is the distance between your pupils in millimeters. Do I use Dist PD or near PD when ordering glasses?.
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