How to measure interpupillary distance tutorial
What to do without PD?! 2 methods to teach you how to measure interpupillary distance!!
The interpupillary distance is the "necessary" value when making glasses, so that the focus of the lens can fall exactly on the center point of the pupils of both eyes. This will affect the clarity of your vision. For those with deeper degrees, It’s even more obvious from a human perspective! Therefore, there will be no problems if the data is completely prepared!
You can go to the ophthalmology or optical shop to ask for the measurement of this value.
If you have an eyeglass prescription or optometry slip on hand, it will be written in the PD field.
Generally speaking
The average interpupillary distance of Asian women is 57-63mm / the average interpupillary distance of Asian men is 62-68mm
If it is not convenient to go to an ophthalmology or optical shop, here are two methods to measure the interpupillary distance.
[Method 1] Measure by yourself
A: (Recommended): Use a mirror at home that is perpendicular to the wall for super quick measurement!
Requirements: A mirror attached to the wall and a long ruler with clear markings (accurate to mm, 1cm (centimeter) = 10mm)
1. Keep your head vertical (avoid tilting forward and backward) and stand in front of the mirror. Place the ruler horizontally against the outer edge of the black eyeball (the ruler must not be bent).
2. Align the 0 scale in the ruler with the outer edge of the black eyeball of your left eye. With your right eye, first look at the scale under the inner edge of the black eyeball of your right eye and read the scale. This scale is your interpupillary distance (PD).
3. Then align the 0 scale in the ruler with the outer edge of the black eyeball of your right eye. With your left eye, first look at the scale under the inner edge of the black eyeball of your left eye and read the scale. This scale is your interpupillary distance (PD).
4. Confirm whether the interpupillary distance in steps 2 and 3 matches. This scale is your pupillary distance (PD).
B: Take it with a digital camera
What you need: A friend, a digital camera and a long ruler with clear markings (accurate to mm)
1. Your friend should be at least 2 meters away from each other. Place the ruler horizontally against the outer edge of your black eyeball. Look straight ahead at a fixed point. Keep your head vertical (avoid tilting back and forth). The ruler should not be bent.
2. Take a close-up photo of the face in a horizontal position (the camera is at the same height as the eyes), enlarge the photo and calculate the interpupillary distance from the outer edge of the black eyeball of the right eye to the inner edge of the black eyeball of the left eye.
Please note:
Repeat the measurement several times to maintain accuracy. In most cases, the interpupillary distance will be between 50mm and 75mm, with 64mm being the most common.
There will be some errors due to manual measurement (the error between the eye position at close range and the normal value is within 3mm)
If you need accurate measurement, please go to the store and let the optometrist use the instrument to test for you.
[Method 2] Refer to old glasses data
You can send us your spare glasses, and we will get the values from the old glasses to make glasses for you. However, if you use this method, the premise is that the lenses cannot be scratched too seriously! This will result in inaccurate measurement!