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- What is PD?
- How to read PD?
Your PD may be written in three ways:
PD (OU), written as "64", means the Binocular PD which is for both eyes.
PD (OD), means the Monocular PD for the right eye, PD (OS), means the Monocular PD for the left eye.
A Monocular OD is written as two numbers, for example, "32/30", "32" represents the PD for the right eye, and "30" for the left eye.
Sometimes PD is written as "62/59" or they are labeled "Far" and "Near". Your PD is usually measured for distance vision, which is 'Far PD", or "62" in this example. For reading glasses, doctors measure your "Near PD" or "59" in the example.
Always enter your "Far PD" for distance vision eyeglasses and enter your 'Near PD" for your reading glasses only. For most people, the difference between Far PD and Near PD is about 2-3mm.
- How to measure PD?
How to measure PD?
PD(pupillary distance) is very important for accurately fitting your lenses to achieve vision acuity. Generally speaking, the PD number for adults stays the same. Average PD for adults is 55-70 mm. For kids, it's about 50-70 mm. A difference of 2-3 mm is allowable.
We highly recommend checking with your doctor. You can also measure it this way.
Step 1: Stand with a friend facing you 30cm away. Place a millimeter ruler on the bridge of your nose. Keep the ruler's "0" measurement exactly in line with the center of your left pupil. Hold the ruler straight!
Step 2: Let your friend read the measurement between your left pupil and your right, while you look straight ahead.
Step 3: For measuring a PD with high accuracy, please do it 3 times and take an average number of them for your final PD measurement.
Tips:
1. For bifocal or progressive lenses, we strongly recommend you get this information from your optician to ensure accuracy.
2. The average PD for adults is 55-70 mm. If your DIY PD number is out of this range, be sure to confirm with your optician.
You can also measure your PD in front of a mirror. Check out how to do it below.
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