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The "Seg" height is the distance from the bottom of the lens to your pupil.
We use this to determine how to make progressive, bifocal, and trifocal lenses.
Step 1
Put on any pair of clear eyeglasses.
Face the camera directly.
Snap a picture.
(It helps to be close up to the camera, and in a well-lit area.)
Step 2
Email the photo to customer service with the frame size information.
