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A safety bevel is a very small, flattened edge or chamfer applied to the sharp corners of a spectacle lens. This technique is applied by a technician after the lens has been cut to its final shape. The goal is to dull any sharp edges that could otherwise chip, break, or cause discomfort.
read more about safety bevel on lenses ...The purpose is protection. The sharp edges of a lens are fragile and prone to chipping when inserted into a frame or when handled. The safety bevel removes this fragile edge, making the lens stronger and more resistant to breakage during handling or impact.
The safety bevel improves comfort, especially with high-power prescriptions. It removes the harsh edge that could rub against the wearer's cheek or brow. It also makes the lens more comfortable for the optician or the wearer to handle.
The bevel is typically applied to both the front edge and the back edge of the lens. This dual application makes sure that neither surface has a sharp, fragile point. The bevel is usually so small that it is barely noticeable once the lens is installed in the frame.
Lens safety is important for your backup glasses. A properly finished lens with a safety bevel is less likely to chip or crack, making sure your backup pair is reliable and safe to use when you cannot wear your contacts.
No, the safety bevel is a standard, automated step in the modern lens finishing process and is typically included in the cost of cutting the lens.
No, the bevel is applied only to the very edge of the lens and does not extend into the main visual zone.
If the safety bevel is too wide, it could become visible inside the frame rim. The bevel should be a very small, clean edge.
A safety bevel is essential for preventing corneal abrasions during lens cleaning or if the frame is bumped. If you can feel a sharp edge on your lenses when you touch them, return to your optician immediately to have the safety bevel reapplied for your protection.
ANSI. Z80.1 Prescription Ophthalmic Lenses (ansi.org). 2024.
The Vision Council. Laboratory Finishing Procedures (thevisioncouncil.org). 2023.
Review of Optometry. Safety in the Optical Dispensary (reviewofoptometry.com). 2024.
ABDO. Glazing Techniques for Modern Lenses (abdo.org.uk). 2024.