How to Measure Your Pupillary Distance?
In the previous article, we discussed “What type of glasses is best for kids?“. In this article, let’s talk about “How to Measure Your Pupillary Distance?”.
What is pupil distance?
When ordering a new pair of glasses or prescription sunglasses online, knowing your PD is important, just like your prescription. The average level of the PD of an adult is about 63 millimeters. PD in one eye (or dual PD) is the distance of the pupil from one eye to the other eye. Dual PD(or single PD) is measured from the bridge of the nose to each eye. Dual PD is considered to be the most accurate because many people may find that the distance of their nose to the pupil is not isometric.
The First Way to Get the PD Number
Stand about 8 inches away from the mirror and hold a ruler against your forehead. Close your right eye and aim the 0 mm mark at the center of your left pupil. Look straight ahead, then close your left eye, then open your right eye. The millimeter line that alines with the center of your right pupil is your PD.
Ask professionals to help.
You can go to a hospital and then go to Go to the ophthalmology department of the hospital. Ask the professional physicians to find the data. If it not measured or it is not measured accurately, the glasses wearers will have a prism effect. And visual fatigue, dizziness, nausea, and other symptoms will occur. You can go to the optical shop and get it with the help of a professional device. The glasses shop will have that device. If you have bought glasses before, you can look at the existing glasses.
Use the PD meter to get that data.
A PD meter is used to calculate more than 30cm of the measured eye by changing the position of the convex lens between the image and the object. It is the equipment with different visual distance conditions. It is above 30cm. Well-marked usually are 30, 35, 40, 50, 65, 100, 200, and infinite. Using this way is simple and accurate. This approach is more accurate than other ways and is the most widely used at present. The way to do this is to look at the small bright spot in the PD machine, keeping your eyes still, and then make some changes.
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