Measuring your Child's Pupillary Distance at Home
PLEASE READ ALL THE OPTIONS BEFORE SELECTING THE BEST ONE FOR YOUR CHILD. DETAILS FOR METHOD 1-3 ARE MORE FULLY EXPLAINED BELOW.
METHOD 1: IF YOUR CHILD HAS GLASSES (AND YOU HAVE A NON-PERMANENT, FELT TIPPED MARKER) METHOD 2: IF YOUR CHILD DOES NOT HAVE GLASSES
METHOD 3: IF YOUR CHILD HAS AN EYE MUSCLE IMBALANCE/STRABISMUS (SUCH AS ESOTROPIA OR EXOTROPIA)
METHOD 4: VISIT A LOCAL OPTICIAN
1. Have your child put on their glasses.
2. Ask the child to cover one eye and look at an object that is at least 20 feet away. For example, they could sit inside and focus on a tree or building out the window.
3. Use the non-permanent marker to place a single dot on the lens over the center of the pupil. 4. Repeat this process with the other eye.
5. To double check this is done correctly: with both eyes open, the child should see the dots overlap when they are looking through their marked glasses at the distance object.
6. Remove the glasses and measure the distance between the two dots with a millimeter (mm) ruler.
1. Have your child look at an object that is at least 20 feet away. For example, they could sit inside and focus on a tree or building out the window.
2. Take a millimeter (mm) ruler and measure the distance from the center of one pupil to the center of the other pupil.
3. You can make this measure even more accurate by taking a flashlight and shining it in your child’s eyes. The reflection on the pupils will help you to find the center of the pupils. When doing this, make sure that the child continues to look at the distant object.
4. Whether you are using a flashlight or not, take this measurement at least 3 times to ensure that your measurements are consistent.
1. If your child’s eyes turn inward or outward when looking at distance, cover one eye and have them look at an object that is at least 20 feet away with the uncovered eye. For example, they could sit inside and focus on a tree or building out the window. It is important that the child’s pupils are facing forward when you take this measurement.
2. Take the measurement in millimeters from the center of the bridge of the nose to the center of the pupil.
3. By doubling this measurement, you will get an accurate measurement of the distance PD. You only need to take this measurement for one eye, not both.