![]() This means that they will measure either the far pupillary distance or the near pupillary distance. The optometrist is able to provide you with a more accurate PD as they can measure the distance according to your needs. The PD is needed to manufacture your glasses because it determines the exact optical center of the lens, which is the point where you look through the lens. Pupillary Distance (PD) is the distance, in millimeters, between the center of one pupil to the center of the other. Unfortunately, these numbers will be meaningless if you do not have an accurate measurement for your pupillary distance (PD). Included are also the correction numbers for close focusing.Īll of these numbers are extremely important when you need to get your prescription from Lensmart and should be as accurate as possible. It will show how the lens will refract the light, a correction number for astigmatism, and the diopters, which are the measurement units for the optical power of your lens. Each eye will have a number indicating how weak it is separately. However, an eye test is important to find the prescription for your left and right eyes. If there are any medical issues with your eyes that eyeglasses cannot solve, they will refer you to an ophthalmologist. They have the equipment to photograph the back of your eyes, test for eye pressure, and see if you have any defects such as cataracts. Most optometrists have the necessary tools and equipment to do your eye test for you as accurately as possible. It is also important to be able to read your own prescription. This will also be helpful when you need prescription sunglasses. The numbers are necessary to provide you with the correct prescription eyeglasses. It is especially the numbers indicated on it that are important. There are a number of elements that are necessary for your prescription. For most people, the difference between Far PD and Near PD is about 2-3mm.Having your eyes tested is the first step to getting a prescription. For reading glasses, doctors measure your "Near PD" or "59" in the example.Īlways enter your "Far PD" for distance vision eyeglasses and enter your "Near PD" for your reading glasses only. Your PD is usually measured for distance vision, which is "Far PD", or "62" in this example. ![]() ![]() ▪ Sometimes PD is written as "62/59" or they are labeled "Far" and "Near". A Monocular OD is written as two numbers, for example, "32/30", and "32" represents the PD for the right eye and "30" for the left eye. ▪ PD (OD), means the Monocular PD for the right eye, and PD (OS), means the Monocular PD for the left eye. ▪ PD (OU), written as "64", means Binocular PD which is for both eyes. For those requiring progressive lenses, we strongly recommend you get this information from your optician to ensure the accuracy of your glasses. Step4. You also need to measure the distance from two pupils to the center of the nose respectively to make sure that you have two PDs(OD & OS).ġ. Step3. Close your left eye and note the reading directly over your right pupil. Step2. Close your right eye and align the 0 mm over the center of your left pupil. Step1. Position yourself arm’s length from your friend or yourself approximately 8 inches (20cm) away from a mirror. Please measure your PD 2-3 times to ensure you get accurate results. Might be a bit different compared to practical measurements. Note: The average PD is between 54 and 78mm. ![]() Recommend to use a physical PD ruler or consult your ophthalmologist.ĭownload Zeelool’s PD ruler Note: Please Printed on A4. Use the PD ruler at the bottom of the page. Print this page on A4 (without scaling, at 100%. The PD is needed to manufacture your eyeglasses because it determines the exact optical center of the lens, which is the point where you look through the lens.
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