Does anyone know how the lens/bridge measurements of the lenses are made? It's hard to tell given that the "lens piece" itself is a single piece of glass 'flat' glass mounted over a supporting construction.
Is the lens width measurement from outer-edge-to-outer-edge of the glass of the lens (thereby the maximal distance), or, from the inner-edge-to-inner-edge of the supporting frame?
Similar line of questioning for the bridge width.
Thanks in advance.