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A temple core wire is a thin metal reinforcement running lengthwise through the center of the plastic or acetate arm (temple) of a spectacle frame. This wire is completely hidden from view. Its sole purpose is structural, it provides strength and allows the arm to be adjusted by an optician.
read more about temple core wire on eyeglasses ...Plastic and acetate materials are naturally flexible but can become brittle or lose shape over time. The hidden metal wire provides necessary rigidity. Without this metal support, the frame arms would not be able to hold their customized shape behind the ear after being heated and bent by an optician.
The core wire is typically made from durable metals such as stainless steel, nickel silver, or monel. Titanium is often used in higher-end plastic frames because it is extremely light and resists corrosion. The wire must be resistant to corrosion from sweat and moisture because it sits inside the plastic.
The core wire is what makes precise fitting possible. An optician heats the plastic arm to soften it, then uses tools to bend the internal metal wire to match the exact curve of the wearer's head and ear. Once the plastic cools, the wire holds the arm securely in the customized position.
Even if you rely on contact lenses for daily correction, having backup glasses with a secure fit is important. The stability provided by the temple core wire in your backup frame ensures that when you need to switch to glasses, the correction stays centered and comfortable, preventing unnecessary eye strain.
High-quality core wires are usually made of corrosion-resistant metals like stainless steel or titanium to prevent rust from sweat or moisture.
No, the core wire is designed to be fully sealed within the plastic arm and should not be visible unless the arm is severely damaged or cracked.
The wire adds minimal weight, but the added rigidity and adjustability it provides are worth the slight weight increase in plastic frames.
If you see a green or dark discoloration inside your acetate frames, the core wire may be oxidizing. If the plastic cracks and the wire is exposed, it can scratch your skin; visit an optician immediately to have the frame repaired or replaced.
The Vision Council. Metal Alloys in Ophthalmic Frames (thevisioncouncil.org). 2024.
ABDO. Properties of Plastic Frame Materials (abdo.org.uk). 2023.
Review of Optometry. Frame Selection and Troubleshooting (reviewofoptometry.com). 2024.
Optical Journal. The Role of Core Wires in Acetate (opticaljournal.com). 2024.