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A lens groover is a specialized tool used in optical labs to cut a narrow, continuous groove along the edge of a spectacle lens. This groove is cut into the lens to accommodate the nylon cord (fishing line) used to hold the lens in a semi-rimless or nylon-mount frame.
read more about lens groover tool ...The main function is to prepare the lens for mounting in a semi-rimless frame. The nylon cord sits securely inside the groove, providing the tension needed to hold the lens in place where the frame rim is missing.
Semi-rimless frames, also called nylon-mount frames, have a rim only along the top of the lens. The bottom half of the lens is held in place by the clear nylon cord, giving the glasses a lighter, cleaner appearance.
The groover tool is typically an automated machine that holds the finished lens steady while a small, spinning cutting blade carves a precise groove into the lens perimeter. The depth and position of the groove must be accurate to make sure the lens sits securely in the frame.
The grooving process is vital for the stability of semi-rimless backup glasses. The groove must be perfect to make sure the lens does not chip or fall out. This stability guarantees your backup pair is reliable and safe when your contacts are removed.
No, grooving is only used on plastic or polycarbonate lenses. Glass lenses are too brittle to be grooved.
The nylon cord is very thin, typically the thickness of fishing line, allowing it to sit discreetly in the groove.
If the groove is cut too deep, it can weaken the lens material, making the lens prone to snapping or chipping along the groove.
Semi-rimless frames rely on a "grooved" lens. If you see a crack running along the perimeter of your lens where the nylon cord sits, the groove may have been cut too close to the lens surface. Replace the lens immediately to avoid shard-related eye injuries.
Review of Optometry. Fitting Semi-Rimless Eyewear (reviewofoptometry.com). 2024.
The Vision Council. Lens Material Integrity (thevisioncouncil.org). 2023.
ABDO. Glazing for Nylon Cord Frames (abdo.org.uk). 2024.
AAO. Eye Safety and Lens Breakage (aao.org). 2024.