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Edge thickness control refers to the techniques used in lens manufacturing to reduce the thickness of the finished spectacle lens edge. This is specifically done for nearsighted patients, whose lenses are thickest at the perimeter.
read more about edge thickness control in lenses ...Edge thickness significantly affects how a lens looks. A thick edge can be visually distracting and make the frame appear heavy. Controlling and reducing the edge thickness improves the aesthetics of the finished glasses and makes the frame look better.
Several techniques are used. The most common is selecting a high-index lens material. Other methods include choosing a frame with a slightly smaller lens size and using specialized edging techniques like rolling or polishing the edge.
Edge thickness directly impacts frame choice. People with high minus prescriptions should avoid very large frames, as a larger frame will expose a thicker lens edge. Choosing a smaller, thicker frame (like an acetate frame) helps conceal the edge thickness.
You wear contacts for their sleek, invisible appearance. Edge thickness control on your backup glasses helps maintain a thin, light look when you switch. This keeps your backup glasses comfortable and cosmetically appealing for days when contacts are not worn.
People with high minus (-) prescriptions, as their lenses are thinnest in the center and thickest at the edge.
No, selecting a high-index lens material reduces the overall thickness the most. Polishing only reduces the visible appearance of the edge.
Yes, by placing the lens in a thick plastic frame, the technician can often hide a significant amount of the lens edge thickness.
If you have a prescription over -4.00, edge thickness is your main aesthetic challenge. While high-index materials help, the most effective "thickness control" is choosing a smaller, rounder frame, which cuts off the thickest part of the lens edge before it is even glazed.
All About Vision. High Index Lenses: Thin Lenses (allaboutvision.com). 2024.
Review of Optometry. Frame Selection for High Minus (reviewofoptometry.com). 2023.
The Vision Council. Spectacle Lens Design Standards (thevisioncouncil.org). 2024.
ABDO. Ophthalmic Lens Dispensing (abdo.org.uk). 2024.