Accurate seg height and PD measurements are needed to ensure that lenses being made for your frames are properly centered on your eyes to achieve optimal viewing clarity.
Please note: Seg Height is currently only supported on devices equipped with the TrueDepth or LIDAR camera systems (e.g., iPhone X and later non-SE models).
PD+ instantly measures pupillary distance (PD) by capturing & processing a single, hi-res facial photo.
Measurement accuracy is guaranteed to be the highest achievable by the capability of your device's camera system.
PD+ instantly measures Segment Height -- Seg Height -- for the frames you are currently wearing.