The pupils height, often just called the height, is the distance from the center of the pupil to the frame’s bottom rim, measured in millimeters(mm). This measurement is frame specific, meaning that for any given person, wearing a different frame will result in a different height measurements.
Once the pupillary distance and pupil heights have been measured, you have essentially established a set of coordinates. These coordinates will tell the edging lab exactly where and how to cut the semi-finished lenses in order for the optical center of the lenses to be perfectly aligned with the center of the pupils when the glasses are worn.
