Photochromic ophthalmic lens of organic materials
AssigneeEssilor International Cie Generale d'Optique
InventorBernard Mignen
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Abstract
An ophthalmic lens made of organic material has at least one layer of photochromic mineral glass within its mass to impart photochromic properties to the lens. This layer has a fibrous structure and may comprise a piece of woven fabric produced from fibres of photochromic mineral glass possessing a refractive index and a coefficient of chromatic dispersion which are equal to those of the constituent organic material of the lens.
Claims6
An ophthalmic lens made of organic material and comprising at least one layer of photochromic mineral glass within its mass, said layer of photochromic mineral glass having a fibrous structure.
A process for manufacturing an ophthalmic lens made of organic material and comprising at least one layer of photochromic mineral glass within its mass, said process comprising the steps of placing a dose of organic material within a mould cavity and placing a layer of photochromic mineral glass having a fibrous structure within the mould cavity, and then causing said organic material to polymerise.
Dependencies are inferred from the claim text.