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Web our digital pd ruler allows you to measure your pd quickly and accurately online. Gather a ruler or pd ruler: Choose a ruler with clear markings or a specialized. Stand 8 inches away from a mirror and hold a. Web at zenni, we understand that obtaining accurate pupillary distance (pd) measurements is not just a step in the. Web if you don’t have a one on hand, you can print out zenni’s pd ruler here. How does zenni’s online pd tool. Web these tools typically require you to upload a photo of yourself and then use facial recognition technology to.