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A hidden eyeglass rim wire is a thin, usually metal, wire used in some plastic or semi-rimless frames. This wire is embedded within the frame material or runs along the top inner edge of the plastic, supporting the lens from behind without being externally visible.
read more about hidden eyeglass rim wire ...The rim wire provides structural support and integrity to the frame. In semi-rimless designs, it strengthens the top bar where the nylon cord is absent. In thin plastic designs, it prevents the frame front from bowing or losing its shape under the pressure of the inserted lenses.
The rim wire is typically made from resilient, thin metals such as stainless steel or titanium. These materials provide high strength with minimal bulk, making them the preferred choice for hidden reinforcement.
The wire is necessary for lens mounting stability because it stabilizes the entire frame front. This stability helps make sure that when the lens is cut and inserted, the frame rim does not stretch or warp, which prevents the final lens fit from being loose.
The hidden rim wire plays a direct role in the frame's longevity. By reinforcing the shape of the frame front, it helps the spectacle frame hold its precise optical alignment over years of use, resisting the common cause of lens misalignment and deformation.
No, the wire is designed to be completely sealed within the frame material and is not visible to the wearer.
No, they are typically used on very thin plastic frames where minimal reinforcement is needed.
The added weight is minimal, and the structural integrity it provides is needed for the frame's reliability.
Hidden rim wires prevent "frame stretching" in thin acetate. If you notice a white or silvery line inside your clear plastic frame, the wire may have shifted. See an optician to ensure the wire isn't putting "stress" on the lens, which can cause rainbow-like distortions.
ABDO. Properties of Plastic Frame Materials (abdo.org.uk). 2024.
The Vision Council. Frame Reinforcement Standards (thevisioncouncil.org). 2023.
Review of Optometry. Lens Stress and Polarized Light (reviewofoptometry.com). 2024.
Optical Journal. Materials Science in Eyewear (opticaljournal.com). 2024.