Measuring Pupillary Distance


Measuring pupillary distance with NYS Optical is a simple two-step process.

Having the right information when ordering online prescription eyewear is a key step in getting your eyeglasses made correctly. What often is not measured by your eye doctor is your pupillary distance (PD.) Your PD is the distance between your pupils in millimeters. If the prescription lenses are not set at the same distance as the distance between your eyes, an unwanted prism is induced which may cause eyestrain. Prisms create a fishbowl effect. In lower prescriptions the amount of prism induced is usually of little consequence and will not cause eyestrain.

To expedite this process, locate and place a millimeter ruler on the bridge of your nose. If you have a friend nearby, ask them to measure the distance between the center of your pupils using the ruler. If you are alone, then place the ruler over the bridge of your nose in front of a mirror. For the average person, the distance between your pupils can be anywhere between 55 and 65 millimeters. Once you have your PD in hand, the rest of the ordering process is reduced to a simple step where you select the type of lens you want on your new pair of eyeglasses.

Over the next series of months we will be offering try-on centers at a select number of retail locations. Currently, you can try on an optical frame at two mall locations in Denver, Colorado. As we expand the NYS Optical Try-on Centers, we will be also offering optical eyewear directly on this site.

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