The measurements between contacts and glasses are different. Learn more about how to read glasses and contact lens prescriptions. We recommend that you contact your eye doctor to see if they kept this measurement on file for you before you DIY.
After measuring your pupillary distance, have fun figuring out what colours, frame size, and glasses shape you like best using our Virtual Try-On feature. Just have your prescription ready and make sure your measurements are accurate before you start the process. Click here to learn more about buying glasses online. Have more questions?
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Try to not to move your head or the ruler. First open your right eye and close your left eye. Look straight ahead and read the millimetre line that matches up with the center of your right pupil.
This number represents your PD in millimetre. Measure your PD 3 to 4 times to ensure the measurement is accurate and consistent. You may also refer to the below range guidance:. We will be glad to help!
Login Register. After receiving an eye prescription, an optician will take your pupillary distance PD measurement before sending off your frames to be fitted with lenses.
This is an extremely important number because it measures the distance between your eyes to ensure your pupils match up with the optical centre of lenses. Measuring Pupillary Distance Pupillary distance is measured in millimetres and even a slight variation can cause a number of vision and eye health problems. Taking accurate PD measurements requires comprehensive knowledge and technical skill. After this age, PD tends to remain constant.
Single or binocular PD measurement refers to the distance between the center of one pupil and the center of the other pupil. A single PD measurement provides one number, such as 60, 63, or 55 mm. Dual PD measurements include two numbers. OD is short for oculus dexter, which refers to the right eye, and OS is short for oculus sinister, which refers to the left eye. Learn how to read an eye prescription here.
To use this method, people should stand about 8 inches away from a mirror. The resulting measurement is their single PD. Individuals can also measure their single PD with the help of another person. The individual who requires a measurement can look at an object that is about 20 feet away from them.
To calculate a dual PD, people will need to measure from one pupil to the bridge of the nose, note the measurement, and then do the same for the other eye. This process is not guaranteed to produce accurate results, so it is advisable to take several single and dual PD measurements and then find the averages. People who already wear eyeglasses can find their PD by putting their glasses on and asking another person to stand in front of them and mark two dots on the glasses right above the left and right pupils.
Then, they can measure the distance between the two dots. Alternatively, a person can use their dual PD and subtract 1.
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