This image is an instructional guide on how to measure your Pupillary Distance (PD) using a printed ruler. Since there is no specific question asked, I will explain the process step-by-step as if you were trying to measure your own PD right now.
Step-by-Step Explanation
1. Prepare the Ruler
*
Print: You need to print this page on paper. Make sure your printer settings are set to
100% size or "No Scaling." If you shrink or enlarge it, the measurements will be wrong.
*
Fold: Look for the dotted line at the bottom of the page that says "FOLD." Fold the paper along this line so the ruler stands up straight like a little tent. This helps hold the ruler steady against your face.
2. Get Ready to Measure
*
Position: Stand about 8 inches (20 cm) away from a mirror. Alternatively, you can ask a friend to help you.
*
Hold the Ruler: Place the folded ruler against your brow (just above your eyes). Keep your head straight and look straight ahead. Do not tilt your head.
3. Take the Measurement
There are two ways to do this, depending on whether you are alone or with a friend.
*
If you are using a mirror:
1. Close your
right eye.
2. Align the
zero (0) mark on the ruler with the center of your
left pupil (the black circle in your eye).
3. Keep your head still! Now, open your right eye and close your left eye.
4. Look at the number on the ruler that lines up with the center of your
right pupil.
5. That number is your PD in millimeters (mm).
*
If a friend is helping you:
1. Your friend holds the ruler against your brow.
2. You look straight at your friend’s nose (not their eyes, so you don’t cross them).
3. Your friend closes one eye and aligns the zero with the center of one of your pupils.
4. Then they switch eyes and read the measurement at the center of your other pupil.
4. Check Your Result
* Most adults have a PD between
54 mm and 74 mm.
* Most children have a PD between
43 mm and 54 mm.
* It is a good idea to measure 2 or 3 times to make sure you get the same number each time.
Example from the Image
In the diagram labeled "Step 5," the example shows:
* The zero is aligned with the left pupil.
* The right pupil lines up with the number
56.
* Therefore, the PD =
56 mm.
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Final Answer:
To measure your Pupillary Distance (PD):
1. Print the ruler at 100% size and fold it along the dotted line.
2. Stand 8 inches from a mirror and hold the ruler against your brow.
3. Close your right eye and align the 0 mm mark with the center of your left pupil.
4. Without moving your head, close your left eye and open your right eye.
5. Read the millimeter mark that lines up with the center of your right pupil. This number is your PD.
*(Typical adult PD is 54–74 mm; typical child PD is 43–54 mm.)*
Parent Tip: Review the logic above to help your child master the concept of printable pd ruler.
