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"Ports made from optical mineral glass - the best?"

In fact – they are! Synthetic lenses made from polymethylmethacrylate are light and rather shock-resistant. The disadvantage of synthetic glass is that it is not very hard which is why it is easily scratched. The lenses are cast from granulate or formed out of sheet material. This results in differences in width and optical errors. Although a synthetic lens is easily polished, it has a tendency over time to develop microscopic cracks and yellowing so that in backlight it shows an undesired haze. The chemical description of the mineral glass lenses is silicon oxide SiO2. By adding other oxides such as aluminum oxide or boric oxide these become refined. Quartz is very closely related to mineral glass except that here the molecules of the SiO2 are in a crystalline order. Mineral glass is a bit heavier with hardness 5 according to Mohs significantly harder than synthetic glass, does not scratch easily and do not yellow. Only hardened mineral glasses, precisely cut, most accurately polished and optically coated fulfill the requirements for the best image reproduction quality.

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