In optical world, PD is known as Pupillary Distance. A distance measured in millimetres between the center of each pupil. All eyeglass wearers should know this is one of the necessary information when making prescription glasses. By providing them, it tells manufacturer of the glasses which position is supposed to put the focus point of each lens. The measurement must be most accurate as it may affect the vision when wearing.
Typically, PD measurement can be obtained from optician who makes the glasses. However, it can be done without visiting any optical shop too. How? Let’s roll!
Look in a mirror or find a friend. Stand 8 inches or 20cm away from a mirror or a friend. Place and hold a millimetre ruler against your brow. Keep your face straight.
Close your right eye and align the ruler’s zero to the center of your left pupil.
Try to not to move your head or the ruler. First open your right eye and close your left eye. Look straight ahead and read the millimetre line that matches up with the center of your right pupil. This number represents your PD in millimetre.
Measure your PD 3 to 4 times to ensure the measurement is accurate and consistent. You may also refer to the below range guidance:
- Range of Adult PD: 54-74 mm
- Range of Child PD: 43-54 mm
If you’re unsure of how does it work or how should you read it correctly, you are always welcomed to visit any of the nearest Focus Point outlets for more assistance. We will be glad to help!