How to Measure Your Pupillary Distance (PD)?
You'll need to know your PD (Pupillary Distance) if you want to order glasses online from Optical4U.com. Don't worry if your glasses prescription doesn't include your PD, we can show you how to measure it by yourself. There are two ways to measure your pupillary distance, one is to measure it yourself and the other is to have a friend or family member help you measure it.
How to Measure Pupillary Distance (PD) Myself
To measure your own Pupillary Distance (PD), position yourself approximately 8 inches (20cm) away from a mirror.
Close your left eye and align the ruler's zero to the center of your right pupil.
Make sure you print our PD ruler (pupillary distance ruler) in advance.
Try not to move your head or the ruler. Close your right eye and note the reading directly over your left pupil. That will be your PD.
* You also need to measure the distance from two pupils to the center of nose respectively to make sure that if you have two PDs(OD & OS).
How to Measure Pupillary Distance (PD) With My Friend's Help
Make sure you print our PD ruler (pupillary distance ruler) in advance.
1. Look straight ahead with both eyes open facing your friend. Let your friend hold the ruler up to your right so the zero end lines up with your pupil.
2. Measure the distance from your right to your left pupil. The number that lines up with your left pupil is your PD.
3. Write the result down. To be certain of the result, let your friend measure a few more times to make sure your measurement is accurate.
4. Let your friend repeat the process on your left eye by measuring the distance from your left pupil to your right. Use the number that lines up with your right pupil. That's your PD. Write the result down. Repeat the process again to make sure the measurement is right.
5. Once you've got your PD measurement, input the numbers in your cart and you're good to go.
How to find Pupillary Distance (PD) on my prescription?
1. Your pupillary distance is usually found at the word “PD” on the prescription form.
2. On your prescription, there may be two numbers separated by a “/” at your pupillary distance. Generally, the first two digits indicate the right pupillary distance and the second indicates the left pupillary distance.
3. Sometimes, the prescription will identify the distant pupillary distance and the near pupillary distance in more detail, indicated by “Dist PD” and “Near PD”, respectively.
4. The average pupillary distance range for adults is 57-72 mm and for kids is about 43-58 mm.