Pupillary Distance (PD)
, by Vero Launier, 2 min reading time
Pupillary distance (PD) is the distance in millimeters (mm) between the center of one pupil to the center of the other. This measurement is important when ordering glasses or contact lenses, as it helps ensure that the lenses will be in the correct position in front of your eyes. This measurement will usually be found on your prescription. If it is not, you can contact your optician for the information.
How is PD useful?
Pupillary distance is the distance between the center of one pupil and the center of the other. It is used to help determine the correct position of eyeglass lenses in front of your eyes. A PD measurement is usually taken during an eye examination. Many people have one eye that is slightly larger than the other, so the PD measurement helps ensure that the lenses will be in the correct position in front of each eye.
Why is an accurate PD measurement important?
An accurate pupillary distance measurement is important for several reasons. First, it ensures that your glasses or contact lenses will be ordered with the correct prescription. Second, it helps to ensure that the optical center of your lenses will be in the proper position in front of your eyes. Third, an accurate PD measurement can help to prevent headaches and eyestrain. Finally, an accurate PD measurement can help you to choose the right frame size for your glasses or sunglasses.
How to measure your PD
To measure your PD, you'll need a ruler or a measuring tape. Position the ruler or measuring tape at the center of your pupil, and then measure from the center of one pupil to the center of the other. The number you get is your PD. If your measurements indicate that your eyes are uneven, you may want to get an eye exam to find out if there is a medical reason for this or if the differences are purely cosmetic.
In conclusion, pupil measurement is an important part of eye care. It is a simple procedure that takes only a few seconds. Measurements are usually taken with a lensometer, which is a handheld device that projects a meter scale into the eye. The doctor or optometrist reads the measurements from the scale.
How to measure your pupil size
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, by Vero Launier Pupillary Distance (PD)
