- Stand a few inches away from a mirror. Hold a ruler with millimeters against your brow. Close your right eye then align the ruler’s 0 mm with the center of your left pupil. Look straight then close your left eye and open your right eye.
- The mm line that lines up to the center of your right pupil is your PD.
Armed with your PD and prescription, you can shop at Glasses.CompUSA.com to find your perfect pair of Computer glasses with blue light blocking protection.