From a pair of glasses first you want to have a clear vision, then comfort and to be resistant avoiding issues over time.
These are the frames components that favor temple closing on the frame front, for safe keeping in minimal space.
You must know that hinges take over almost all mechanical forces acting on eyeglasses, talking here about:
So they are subject to events, which in time, lower their resistance.
The material used for all types of eyeglass hinges is metal for increased strength.
The most used types are:
This type of hinge provides more comfort and resistance than the classical one. The flexible temples open to the size of the head and withstand much better to bending and hitting.
But be careful because the more complicated and singular the design is, so fit and repairing glasses is more complex.
Require the use of oil over hinges for better sliding of components.
Attention! Do not use cooking oil or car oil, preferably use a light oil, as used in electrical engineering.
The solution is to replace the damaged or the bent hinge if possible.
If not, replace the temple with a similar one or both temples of the glasses because you want them to be identical. Some time is necessary that all the frame to be changed.
If it is a plastic frame, changing a hinge is an activity that have to be performed in specialized optical stores.
The same for metal frames, but is more complicated, requiring particular welding that is not performed in many of optical stores.
These welds are not cheap. They are not lasting and alter the design of frame in that area, so have many disadvantages.
When it comes about eyeglass hinges, some of the producers lower their quality standards in favor of unusual and fascinating creations, so take my advice: go with the classical hinges, they are tested over time.
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