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A rimless eyeglass screw mount is a tiny hardware mechanism used to attach a spectacle lens directly to the bridge or temple arm of a rimless frame. This mount consists of a small screw and a barrel or nut that passes through a precise drill hole in the lens.
read more about rimless eyeglass screw mount ...The main function is securing the lens without a metal or plastic rim. The mount provides a fixed, durable connection point between the lens and the frame components, holding the entire assembly together and preventing the lens from rotating.
Rimless screw mounts require lenses to be made from durable materials like polycarbonate or Trivex. These materials are highly resistant to cracking or chipping when drilled. The mounting process is gentle, but the drill holes create stress points that demand a tough lens material.
Precision drilling is necessary because the drill holes must align perfectly with the frame hardware. If the holes are even slightly misaligned, forcing the screws into place can cause the lens to crack or place undue stress on the mount, leading to future breakage.
The stability of the screw mount is important for your backup glasses. Since rimless frames are delicate, a secure mount makes sure the lens remains perfectly stable and centered, giving you clear, distortion-free vision when you switch from your contacts.
Yes, the screws are miniature and should be handled by an optician to prevent overtightening, which can crack the lens.
Yes, rimless frames are generally more fragile because the lens itself is the structure. Care should be taken to avoid dropping or bending them.
No, the lens must be made of highly durable materials like polycarbonate to withstand the stress of the drill holes.
If you see small "spider-web" cracks (stars) around the drill holes of your rimless glasses, the screws may be too tight or the material may be under stress. See your optician immediately; these cracks can cause the lens to shatter unexpectedly, posing a risk to your eyes.
The Vision Council. Rimless Mounting Standards (thevisioncouncil.org). 2024.
ABDO. Glazing Rimless Spectacles (abdo.org.uk). 2023.
Review of Optometry. Lens Material Durability for Rimless (reviewofoptometry.com). 2024.
AAO. Eye Safety and Lens Breakage (aao.org). 2024.