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Ekomi 4.8/5.0

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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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According to the law on sales registration, the seller is obliged to issue and provide receipts for all clients. It is also obligatory for the seller to register the sale with the tax administrator with no delay, within 48 hours in case of technical failure.