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A stop hinge is a specific type of hinge mechanism built into some eyeglass frames. Its purpose is to limit how far the temple arm can close. Instead of allowing the arm to fold flat against the frame, the stop hinge halts the movement just before the temple tip touches the back of the lens.
read more about stop hinge on eyeglass frames ...The main job of this hinge is to prevent scratches. On standard frames, the end of the temple arm often rests directly against the back surface of the lens when the glasses are folded. Over time, this rubbing creates a permanent scratch or mark on the lens. The stop hinge creates a safe gap, ensuring the metal or plastic arm never touches the glass.
The mechanism is simple but effective. The metal barrel of the hinge is designed with a small extra tab or a specific shape. When you fold the glasses, the temple arm hits this metal "stop" before it can hit the lens. It creates a physical barrier that holds the arm in a suspended position, hovering just above the lens surface.
You can tell the difference by looking at your glasses when they are folded. A standard hinge allows the temples to fold tightly and compactly against the frame. A stop hinge leaves the temples sticking out slightly, making the folded glasses appear a bit thicker from front to back. This extra space is intentional and functional.
This feature is especially valuable for lenses with anti-reflective (AR) coatings. Scratches on the back surface of a lens are very noticeable to the wearer and can ruin the AR coating. By mechanically preventing contact between the frame and the lens, a stop hinge extends the life of your lenses and keeps your vision clear.
You can usually identify a stop hinge by looking at the metal barrel where the temple connects to the frame front. You will see a small metal tab, notch, or extended block on the frame front that is not present on a standard hinge. When you open the temple, it moves freely, but when you close it, the temple arm hits this metal tab, physically blocking it from folding any further inward.
No. The stop mechanism is part of the metal casting of the frame itself. It cannot be added later. It is a feature you must look for when buying a new frame.
Because stop hinges prevent the arms from folding completely flat, the glasses take up more space. You may need a deeper case, often called a "clam shell" case, to hold them without squashing the frame.
Yes, stop hinges are very common on high-quality rimless frames. Since there is no frame rim to protect the lens edge, the lens is very exposed, making this protective hinge very important.
If you notice that your lenses always get scratched in the same spot on the back surface, show your optician. It is likely caused by your temple tips rubbing the lens. Your optician can adjust your current frame to prevent this, or they can recommend a new frame with a stop hinge to solve the problem permanently.