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A cold-insert eyeglass bevel is a specialized cut applied to the perimeter of a spectacle lens. This bevel is designed for frames made of flexible plastics (like TR-90) that allow lenses to be pressed into the rim without using heat.
read more about cold insert eyeglass bevel ...The main benefit of the cold-insert bevel is efficiency and safety. The lens is cut precisely to a specific size, often slightly larger than the frame's opening. The bevel helps guide the lens into the rim groove as the plastic stretches, minimizing the risk of stress cracks.
Hot insertion involves heating the plastic frame to make it expand before the lens is inserted. Cold insertion relies on the elasticity of the plastic itself. This saves time and prevents potential heat damage to the frame or lens coatings.
Cold-insert bevels are used on frames made of highly resilient and flexible materials, such as nylon, memory plastic, or thin metal alloys. These materials can temporarily deform to allow the lens to snap into place.
The cold-insert bevel protects the integrity of the lens during assembly. By removing the sharp, fragile edge and guiding the lens into the rim, the bevel helps prevent chipping and cracking that might otherwise occur under the pressure of the lens mounting process.
No, the frame must be flexible. The lens must be cut precisely and made of a durable material.
No, the bevel is designed to be fully hidden within the frame's rim groove.
Yes, if the frame material is too rigid, the pressure applied can chip or crack the lens during assembly.
Cold insertion is used for Optyl or highly flexible nylon frames. If your lenses "pop out" easily, the bevel may be too small or the frame stretched. An insecure lens can cause "induced prism" if it shifts, leading to eye strain. Have an optician verify the lens tension.
The Vision Council. Laboratory Finishing Procedures (thevisioncouncil.org). 2024.
ABDO. Glazing and Fitting (abdo.org.uk). 2023.
Review of Optometry. Troubleshooting Frame Fit (reviewofoptometry.com). 2024.
Optical Journal. Plastic Frame Materials (opticaljournal.com). 2024.