Pupillary Distance or known as PD is the distance between the centers of your both pupil. Pupillary Distance is much needed when you are going to buy prescription eyeglasses. Yes, you will be asked about your Pupillary Distance when you are going to buy prescription glasses. It is not a problem when you go to optician and measure up your PD. The optician will give you the PD if you are about purchasing prescription eyeglasses in his or her recommended eyeglasses store. But, it is a problem for you if the optician encrypts your Pupillary Distance so that only your optician knows the exact value of your PD. This will make you unable to buy the right prescription eyeglasses on the internet which is obviously way more affordable than the land based eyeglasses store sells.
How to solve this problem? Well, to be honest, it is always recommended to measure your PD by optician because the number will be precise and reliable. But, if you cannot get it from your optician, you may ask your friends or family members to measure the distance between center to center by ruler in mm. By doing this trick, you can know your Pupillary Distance and you can purchase quality eyeglasses on the internet.
