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An inner rim nylor groove is the channel cut along the edge of a lens to hold the nylon cord used in semi rimless frames. The cord sits inside the groove and secures the lower portion of the lens. This structure allows frames to stay lightweight while keeping lenses stable. Many modern semi rimless designs rely on this feature.
read more about inner rim nylor groove ...The groove is created during lens edging with precision cutters. Its depth and width must match the cord's thickness. The cord rests inside the groove and tightens to support the lens. Proper shaping is important for secure fit.
The groove creates a strong mechanical bond between the lens and frame. It prevents the lens from slipping downward. Because only part of the frame surrounds the lens, stability depends on the correct groove shape. A smooth, even groove supports durability.
They are used in semi rimless frames for both prescription eyewear and sunglasses. Many lightweight performance frames use this system. Rimless or drill mount designs may also use variations of cord support. Labs customize grooves based on frame specifications.
An inner rim nylor groove is the channel that holds a nylon cord in semi-rimless frames. Check that the lens edge sits evenly in the groove and that the nylon line looks tight, not frayed. Over time, the cord can stretch, which can lead to lens rattle or a lens edge lifting. If you notice movement, a shop can retension or replace the line before the lens pops out.
Yes, cords can wear over time. Replacement is simple and done by an optician.
Grooves reduce edge thickness slightly but are designed to maintain strength for everyday wear.
Only frames designed for semi rimless construction require this feature.
A loose lens usually means the cord needs tensioning or replacing.
What Is an Inner Rim Nylor Groove. Lens.com. https://www.lens.com/what-is/an-inner-rim-nylor-groove/. Accessed January 21, 2026
Changing Lenses - Nylon Semi-Rimless. 20/20 Magazine. https://www.2020mag.com/article/changing-lenses-nylon-semi-rimless. Accessed January 21, 2026
How to Fix Semi-Rimless Glasses. iFixit. https://www.ifixit.com/Guide/How+to+Fix+Semi-Rimless+Glasses/93606. Published on June 18, 2024
The parts of glasses: names & phrases. Banton Frameworks. https://www.bantonframeworks.co.uk/blogs/manufacture/parts-of-glasses. Published on January 13, 2021
How to Install Lenses (Rimless Frames). The Sunglass Fix. https://www.thesunglassfix.com/sunglass-lens-installation-rimless-slide-show. Accessed January 21, 2026