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Ekomi 4.7/5.0

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Hard contact lenses

The first hard contact lenses were made of glass. In 1936 there was the discovery of PMMA – polymethylmet­hacrylate, which replaced the glass. It is a material with sufficient hardness, resistance to scratching and breakage and is easily processed, biologically harmless to dilute acids and solvents. Nonpolar surface minimizes deposits, which leads to a lower incidence of eye disease. A big disadvantage of hard contact lenses is their impermeability to gases.


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