All prescription motorcycle sunglass orders require your Pupilar Distance #, or PD. (PD) is the simply distance between your right and left pupils. This number is used to determine the focal point on your prescription lenses. It can be expressed as a single number or as 2 numbers. If 2 numbers, each number represents the distance from the middle of your nose to your left or right pupil.
You can get this from your Optometrist or whoever made your glasses last. You can also provide us your PD on your own. It’s very simple. All you need is a marker or permanent marker.
1. Look in the mirror with your regular glasses on. Dot each of the lenses with your marker where the centers of your pupils are.
2. Measure the distance between the two dots on your lenses in millimeters. Does this by laying the ruler flat on a table, then position the left dot directly over “0” millimeters. Then look directly over the right dot, and note the millimeter number. This number will be between 55 and 70 millimeters.
3. Or, you can also have someone place a ruler up to each pupil and measure the distance between the pupils. See attached picture.