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Bevel placement refers to the exact position and curve of the groove cut into the edge of a spectacle lens. The bevel is the V-shaped groove that locks the lens into the rim of a full-frame spectacle.
read more about bevel placement in eyewear edging ...The placement of the bevel is important for making sure the lens sits correctly in the frame. The bevel must be perfectly aligned with the frame's internal groove. If the placement is wrong, the lens will either stick out too far on one side or fall out of the frame.
Bevel placement is determined by the frame type and the lens thickness. For thick lenses, the bevel may be moved forward or backward to minimize the appearance of the lens thickness. For full-rim plastic frames, the bevel is typically centered.
The bevel former is a component inside the edging machine that controls the angle and position of the bevel cut. It adjusts the grinding wheels precisely to make sure the final bevel is correct for the specific frame material (plastic or metal) and size.
Accurate beveling makes sure your backup glasses are secure. The lens needs a perfect bevel to stay locked in place. This security is important for reliable, distortion-free vision when you temporarily remove your contacts.
No, the bevel is cut slightly differently. Plastic frames usually need a centered, deeper bevel. Metal frames need a shallower bevel.
No, the bevel should be entirely hidden within the groove of the frame rim.
This refers to a technique where the bevel is placed far forward on a thick lens to visually hide the back edge, making the lens look thinner from the front.
If your lenses "bulge" forward or look excessively thick from the side, the "bevel placement" was poorly chosen. An optician can often use a "1/3-2/3" bevel placement to hide lens thickness, making high prescriptions look more aesthetic.
The Vision Council. High Prescription Dispensing (thevisioncouncil.org). 2024.
Review of Optometry. Cosmetic Dispensing for High Ametropes (reviewofoptometry.com). 2023.
ABDO. Bevel Types and Applications (abdo.org.uk). 2024.
Optical Journal. Lens Edging Styles (opticaljournal.com). 2024.