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In order to make bifocal, trifocal or progressive lenses, segment height is required as it will determine exactly where the reading portion has to be fitted. Often known as Seg Height or SH, segment height is the vertical measurement from the bottom of the lens to the pupil. This formula helps to get accurate glasses, most of the time. The measurement is specific for each frame and the person wearing it.
Segment height is however not necessary for single vision lenses. Usually, doctors do not mention segment height measurement but you can comfortably measure it at home by yourself or taking any friend's help.
It is possible to measure segment height on your own at home. You just need:
If you find it difficult to do it yourself, you can ask your friend or family member to take the reading.
So with this segment height, you can now order perfect pair of glasses at Framesbuy and experience enhanced vision.