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6.1

Across
Point on lens halfway between the two vertical lines on the horizontal midline.
Difference between the A and B measurement.
Smallest distance between lenses.
Line parallel and halfway between the horizontal lines at the top and the bottom of the lens in the datum system.
Also know as the datum line.
The vertical measurement between the two outer most vertical lines
Length of the lens along the datum line.
Measurement from center of barrel screw hole to middle of bend.
Down
Width of the lens along the horizontal midline
A measurement
Distance from the GC to the apex of the bevel furthest away, doubled.
Measurement from middle of bend to the end of temple.
Distance between the geometrical centers of each lens.
Reference point located along the datum line halfway between the edges of the lens.
Vertical depth of the lens through the datum center.
An improvement to the Datum System.