Here's what to know. Health Conditions Discover Plan Connect. Medically reviewed by Sara N. What is it? What is pupillary distance? How to measure your pupillary distance at home. Types of PD measurement. How does PD impact my prescription? The bottom line. Read this next.
Medically reviewed by Ann Marie Griff, O. Dual PD measurements include two numbers. OD is short for oculus dexter, which refers to the right eye, and OS is short for oculus sinister, which refers to the left eye. Learn how to read an eye prescription here. To use this method, people should stand about 8 inches away from a mirror. The resulting measurement is their single PD. Individuals can also measure their single PD with the help of another person. The individual who requires a measurement can look at an object that is about 20 feet away from them.
To calculate a dual PD, people will need to measure from one pupil to the bridge of the nose, note the measurement, and then do the same for the other eye. This process is not guaranteed to produce accurate results, so it is advisable to take several single and dual PD measurements and then find the averages. People who already wear eyeglasses can find their PD by putting their glasses on and asking another person to stand in front of them and mark two dots on the glasses right above the left and right pupils.
Then, they can measure the distance between the two dots. Alternatively, a person can use their dual PD and subtract 1. An optician can measure PD when fitting glasses. However, a person who buys glasses online may need to measure their PD at home.
Please note that the writer has not tested these products. All information is research-based. Record this measurement. This is your distance binocular PD. For reading glasses , subtract 3 mm from your distance binocular PD. This is your near PD. You may want to repeat these steps a few times to ensure you are consistent with your PD measurements. If you already wear prescription eyeglasses, here's an alternate way to measure your pupillary distance.
You just need a non-permanent marker for this one. Using just your left eye, put a small mark on the left lens of your glasses, directly in front of your pupil. Using just your right eye, put a small mark on the right lens of your glasses, directly in front of that pupil. PD is the distance between the center of your pupils, measured in millimeters mm. It can be measured by yourself or your eye care professional. You need an accurate PD to ensure the correct placement of the lenses on your frames.
It centers your prescription in front of your pupils, for the clearest and most accurate vision with your new glasses. Inaccurate PD can cause unnecessary eye strain and headaches. Whenever possible, we recommend getting your PD measurement from your eye care professional. Dual PD is also known as monocular PD.
It is the distance between one pupil to the center of your nose bridge. Quick tips:. If you have recently visited your eye doctor for an eye exam, you can find your PD on your prescription. If it was not provided, that opens up two possibilities.
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