Hide-A-Bevel & 30/70 Step Bevel Placement: Concealing Edge Thickness in Frames

A standard ophthalmic frame rim is roughly 1.8 mm to 2.2 mm deep in metal frames, and 3.0 mm to 4.0 mm deep in acetate frames. If a lens with a $6.0\ \text{mm}$ edge is edged with a centered 50/50 bevel:

$$\text{Front Protrusion} = \frac{6.0\ \text{mm} - 2.0\ \text{mm (rim)}}{2} = \mathbf{2.0\ \text{mm protruding past frame front}}$$

This creates an unsightly white lip of plastic hanging out of the front, making the spectacles look dramatically thicker and clumsier than necessary.

Advanced industrial edgers (such as Nidek ME-1200 or Essilor Mr Blue) permit custom 3D bevel contouring:

1. 100% Front Curve Tracking: The apex of the $110^\circ$ V-bevel follows the exact front curvature of the lens, placed precisely $0.5\ \text{mm}$ behind the front surface.
2. Result: The front of the lens sits completely flush with the frame rim. 100% of the remaining edge thickness is directed backward toward the wearer's temples and face, where it is shielded from view by the temple arms.

Many opticians mistakenly apply a mirror-gloss 'High Polish' to thick minus edges. In reality, a mirror-polished edge turns the rim into an internal optical prism, bouncing ambient light internally and creating bright, distracting white concentric 'myopic rings' (Coke-bottle rings).

ELLASUV technicians apply a Satin (Matte) Hand-Rolled Edge: slightly beveling sharp perimeter corners and leaving a gentle diffused satin texture. This completely neutralizes internal reflections, rendering the edges virtually invisible to outside observers.