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An eyeglass hinge plate is a small, flat metal piece that provides a stable surface for the hinge barrels to connect to the frame material. On plastic frames, the hinge plate is embedded and secured inside the acetate or plastic material.
read more about eyeglass hinge plate ...The main function of the hinge plate is to distribute stress. When the temple arm opens or closes, the force is spread across the hinge plate, which prevents the pressure from damaging the surrounding plastic material. This protects the frame from cracking at the hinge.
In plastic frames, the hinge plate is usually secured using heat and pressure during the manufacturing process, or it is held in place by metal rivets that pass completely through the frame material.
Hinge plates are typically made from durable, corrosion-resistant metals such as stainless steel, monel, or titanium. These metals provide the rigidity and strength needed to withstand years of repeated movement.
The strength provided by the hinge plate makes your backup frames reliable. Since the plate protects the hinge, it helps make sure the frame holds its fit and alignment, providing stable vision correction immediately when your contacts are removed.
No, the hinge plate is usually embedded deep inside the plastic material and is not visible from the exterior.
Replacing a damaged hinge plate is difficult and often requires sending the frame to a specialized repair technician.
No, on metal frames, the hinge barrels are typically soldered or welded directly to the frame rim.
If the hinge area of your plastic glasses feels hot or looks "bubbled," the internal hinge plate may be reacting to heat or chemicals. If a hinge plate pulls out of the acetate, visit a specialist; these require ultrasonic welding or specialized pins to be safely re-anchored.
The Vision Council. Ophthalmic Frame Standards (thevisioncouncil.org). 2024.
ABDO. Spectacle Frame Repair and Maintenance (abdo.org.uk). 2023.
Optical Journal. Anatomy of a Hinge (opticaljournal.com). 2024.
Review of Optometry. Managing Frame Materials (reviewofoptometry.com). 2024.