The PD is not always on your prescription, but we cannot make your glasses without it. The PD ensures that your child sees exactly through the right part of the glass. Don't know what the pupil distance of your child is? No problem, there are several ways to measure it.
If you have an iPhone X (or higher), use this app which measures your PD at lightning speed. Use "far PD" as the result.
If you have an Android 6.0 (or higher) then use this App which will give you reliable results immediately.
If you are not sure, please read on here. Soon you will also be able to measure your PD via our Virtual Try Me Tool.