what are mixed materials glasses?

[Mower]

what are mixed materials glasses?

[Spring City]

Mixed materials glasses, also called combination frames eyeglasses, are eyeglasses with frame composed of a variety of materials such as plastic, metal and other materials. You might say that combination frames are all mixed up. That's because they do not use the same frame material for the whole frame. For example, the frame front might be metal while the temple use Zyl, leather, crystal or wood.