How to measure interpupillary distance tutorial
What if you don't have PD?! 2 ways to measure your pupillary distance!
Interpupillary distance is a "necessary" value when manufacturing glasses, so that the focus of the lens falls exactly on the center of the pupils of both eyes. This will affect your visual clarity, which is more obvious for people with higher prescriptions! Therefore, complete data is necessary to ensure there are no problems when making glasses!
You can ask for the measurement of this value at an ophthalmologist or an optician.
If you have a prescription or eye test sheet, please write it in the PD field.
Generally speaking
The average pupil distance for Asian women is 57-63mm. The average pupil distance for Asian men is 62-68mm.
If it is not convenient to go to an ophthalmologist or optician, the following two methods are provided to measure the pupil distance.
【Method 1】Self-measurement
A: (Recommended): Use a mirror perpendicular to the wall at home for super fast measurement!
What you need: A mirror that fits against the wall and a ruler with clear scale (accurate to mm, 1cm = 10mm)
1. Stand in front of a mirror with your head upright (avoid leaning forward or backward) and place a ruler horizontally against the outer edge of your eyeball (the ruler should not bend).
2. Align the 0 mark on the ruler with the outer edge of your left eye's pupil. With your right eye, first look at the mark just below the inner edge of your right eye's pupil. Read the mark. This is your pupillary distance (PD).
3. Then align the 0 mark on the ruler with the outer edge of your right eye's pupil. For your left eye, first look at the mark below the inner edge of your left eye's pupil. Read the mark. This mark is your pupillary distance (PD).
4. Confirm that the pupil distances from step 2 and step 3 match. This scale is your pupil distance (PD).
B: Take a picture with a digital camera
What you need: a friend, a digital camera, and a ruler with clear scale (accurate to mm)
1. Stand face to face with your friend at least 2 meters away. Place a ruler horizontally against the outer edge of your eyeball. Look straight ahead at a fixed point, keep your head upright (avoid leaning forward or backward), and do not bend the ruler.
2. Take a close-up photo of your face horizontally (with the camera at the same height as your eyes), then zoom in on the photo and use the distance from the outer edge of your right eyeball to the inner edge of your left eyeball to calculate your pupillary distance.
Please note:
Repeat the measurement several times to maintain accuracy. In most cases, the pupillary distance is between 50mm and 75mm, with 64mm being the most common.
There will be some errors in manual measurement (the error between the eye position at close range and the normal value is within 3mm)
If you need precise measurement, please go to the store and have the optometrist test it for you using the instrument.
【Method 2】Refer to the data of old glasses
You can send us your spare glasses and we will use them to obtain the measurements for your prescription. However, if you use this method, the lenses must not be severely scratched! This will result in inaccurate measurements.