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Please upload your prescription to fdspecs@gmail.com.

1. You’ll need a ruler with millimeter measurements and a mirror or a friend.

2. If using a mirror, try to look straight ahead and into the distance as you measure. If a friend is taking your measurements, try to look past them (straight ahead) into the distance to avoid the result being too narrow.

3. Rest the ruler against the bridge of your nose and line up the middle of your left pupil with the zero line on the ruler. You can now measure the distance between your pupils.

4. Measure across to the middle of your right pupil, still looking into the distance. The average PD for adult women ranges from 46mm to 65mm; adult men ranges from 59mm to 74mm.

5. Repeat these steps two to three times to get a consistent number.

Quick tip: If your ruler is in centimeters, you can convert it online, but don’t measure your PD in inches. It might result in a wrong conversion and your measurement won’t be accurate. If you measure your PD the wrong way, you won’t have the right lens placement.

3 simple steps to measure dual PD

Dual PD is also known as monocular PD. It is the distance between one pupil to the centre of your nose bridge. It comprises of two measurements and is generally indicated as ‘30(left)/33(right)’.

1. Place the zero line of the ruler at the centre of your nose bridge.

2. Measure the distance between your nose bridge to the centre of your left pupil.

3. Repeat the same procedure with your right pupil.

Quick tips:

• Ask a friend: measuring your PD on your own might be a little tricky, so having a friend will be easier.

• Hold still: the more still your eyes are, the more accurate the result.

• Ask your optician to measure your dual PD if you want the most accurate results.

Where can I find my PD?

When shopping for your next pair of glasses, it’s important to have all your prescription details handy to make the process quick and easy.

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.

First, there’s a chance your prescription is for contact lenses, which is different than eyeglasses. The measurements between contacts and glasses are different.

Second, if you do have a glasses prescription but still can’t find your PD, the number may be missing because your optometrist or optician simply didn’t pass it on to you, as they would take care of it when you shopped in store. We recommend that you contact your eye doctor to see if they kept this measurement on file for you before you DIY.