LENSAS / Technical reading
Frame geometry: A, B and bridge
In the boxing system, A is the horizontal width and B the vertical height of the box enclosing the lens shape. The bridge separates the two eyewire boxes.
Reading a frame
Measurements should describe the shape being mounted. Nominal temple markings help identify the model but should be checked.
Contour and orientation
Preserve units, scale, side and orientation when transferring a shape. A mirrored contour may look plausible on screen while being wrong for mounting.
Limit
A and B do not describe the whole contour. Use the actual shape when the process depends on complete geometry.
References
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