Pupillary distance (PD) measures the distance between the centers of your pupils. This measurement is used to determine where you look through the lens of your glasses and should be as accurate as possible. The average adult’s PD is between 54-74 mm; kids’ are between 43-58 mm. Your eye doctor will usually measure your PD during an eye exam. However, if it was not given to you, the below 5 steps will help you measure it yourself.
What Is Pupillary Distance?
PUPILLARY DISTANCE (PD) measures the distance between the centers of your pupils. This measurement is used to determine where you look through your glasses’ lens and should be as accurate as possible. The average adult’s PD is between 54-74 mm; kids’ are between 43-58 mm. Pd 62 PD = 62 mm If you do not have your PD from your eye doctor, you can measure it yourself with the help of a friend, or you can measure it yourself with our step-by-step guide below.
Why Is It Important?
Every set of prescription lenses has an “optical center,” determined by pupillary distance. Pupillary distance determines where you look and be as accurate as possible.
What Is Single Vs Dual PD?
SINGLE PD is the pupillary distance between the center of one pupil to the other, which can be a distance PD or near PD. Distance PD can be used to order any type of prescription glasses except reading glasses. Read below to learn how to calculate near PD for reading glasses. DUAL PD, or monocular PD, consists of two numbers and is the distance between the centers of each pupil to the bridge of the nose. Dual PD is usually written in the following notation: 32/30. The first number is always the right eye (OD) measurement, and the second number is the left eye (OS).
Measure The Distance
Your prescription may tell you your PD. But if the PD is not available, use your friend or a mirror to help you figure it out. Guide on how to measure your PD with the help of a friend: 1. Keep both eyes open 2. Have your friend put the zero on the millimeter ruler over the center of one pupil. 3. Measure the distance to the center of the other pupil.
What do ‘OD’ and ‘OS’ mean?
OS and OD are Latin words that stand for Oculus Sinister and Oculus Dexter, respectively. These terms are often written on your eye prescription. OD refers to the right eye, and OS refers to the left eye.
Sphere, Cylinder, and Axis
The sphere tells you how strong your eye prescription needs to be in terms of eyewear.
Axis is used to represent the measure of astigmatism, and the numbers written under the cylinder mean how much power is needed to correct astigmatism.