METHOD FOR TREATING A LENS APT TO TRIMMING

• Main Authors: CONTE DOMINIQUE, LACAN PASCALE
• Format: Patent
• Language: English
• Published: 10.05.2006
• Subjects: CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS; CHEMISTRY; GLASS; JOINING GLASS TO GLASS OR OTHER MATERIALS; METALLURGY; MINERAL OR SLAG WOOL; PERFORMING OPERATIONS; PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCESIN A PLASTIC STATE; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS; SURFACE TREATMENT OF GLASS; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

A method for treating an ophthalmic lens comprising two main sides, wherein at least one side comprises an organic or mineral external layer coated with a MgF2 temporary protective layer, said method comprising a specific treating step selected amongst the following steps: - a liquid phase chemical treatment of the temporary protective layer, leading to the formation of MgO and/or Mg(OH)2 on the temporary protective layer,- a deposit of at least one non fluorinated metallic oxide and/or of at least one non fluorinated metallic hydroxide on the temporary protective layer through transfer thereof from an electrostatic film or through vacuum evaporation thereof directly on the temporary protective layer,- the deposit of the MgF2 temporary protective layer on the external layer occurs through vacuum evaporation at a speed lower than or equal to 0.5 nm/s.