PD or Pupillary Distance is the distance between the pupils of each eye. Usually it is not provided by your optometrist and taken by the optician when you place order for eyeglasses. We highly recommend that you get this PD value when you have your eye examination from the Optometrist and keep it safe.
This value is measured in mm (MILLIMETER) which is used to align the center of the lenses with the pupil. The PD is very important measurement specially for strong prescription. Incorrect PD may result in eye strain or headache.
If you do not have the PD on your prescription, you can measure it as shown below:
Follow these steps to measure PD
|Step - 1||
Place a simple mm ruler on your nose so that the starting point of the ruler is exactly at your left or right eye pupil. Keep the scale straight
|Step - 2||
Make Sure to look straight
|Step - 3||
Stand in front of the mirror or ask one of your friend to read the scale to measure the distance between the pupils.
|Step - 4||
Repeat this at least three times to me more accurate.
In most of the cases, PD value ranges between 57 mm to 65 mm with most common 63 mm
At times you will find PD written as 63/61 In such cases the first value is for Distance PD which may be entered while placing order while the other value 61 is near PD which may be left in the instruction box of the cart.