What is PD? PD is the term for the distance between two centers of human pupil. Usually this distance is different according to age or permanent condition of a person’s eyes. PD is used by the optometrist to determine the focal point of the eye before making eyeglasses.

If no PD for you from opticians, and you want to know your own PD! Then it could be the easy way, that is; using a millimeter ruler and a mirror. Look then focus on the mirror Take a mm ruler and place it over the bridge of your nose with the 0 over the center of one pupil in one eye and take the measurement to the center of the pupil in the other eye, If your eyes are very dark and the pupil can not be seen clearly can you measure from the inner edge of the iris in one eye to the outer edge of the iris in the other eye. Repeat this whole process at least three times to try and get a consistent measurement in millimeters.

Zenni Optical also provides various options for those of you who want to choose eyeglasses. Zenni Optical is an optical first to offer an online purchase. Zenni: the #1 online eyeglasses store for you!

If your PD is known exactly, then you can order your favorite glasses frames online at Zenni Optical by entering your PD measurement on a column that has been provided to the customer. Zenni offers a wide selection of frames which you can customize with your face character. Spectacles frame models you can see on the site ZenniOptical.com

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