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The purpose of the hinge in eyeglass frames is primarily to allow the temples to fold behind the frame front. This design enables the frames to be compact and portable, making it easier to store and wear them. Hinges provide flexibility, allowing the temples to swing open for wear and close for storage, which is essential for the functionality and comfort of the eyeglasses.

While there are other components of eyeglass frames that serve various functions, the hinge specifically facilitates the movement of the temples, enhancing the overall user experience. It does not connect the lenses to the frame, support the frame on the nose, or hold the bridge in place, which are roles fulfilled by different parts of the frame.