Composite ophthalmic lens and method for obtaining same
AssigneeEssilor International (Compagnie Generale d'Optique)
InventorsPeiqi Jiang, Stephane Cabeza, Gilbert Menduni
Life of this patent
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Abstract
The composite ophthalmic lens (1) comprises a first layer (2), at least 200 micrometers thick, forming a front part of said lens, of a first polymeric material of refractive index higher than or equal to 1.60 and having a front face (4) constituting a front optical surface S1, and a second layer (3), at least 200 micrometers thick, of a second polymeric material forming a rear part of said lens and having a rear face (6) constituting a rear optical surface S2, the interface (5) between these two layers constituting an optical surface S3 parallel to the rear optical surface S2.
Claims20
Composite ophthalmic lens (1) comprising a first and a second adjacent layer defining between them an interface (5, 15) characterized in that:
- the first layer (2, 12), at least 200 micrometers thick, of a first polymeric material of refractive index higher than or equal to 1.60 forms a front part of said lens and has a front face (4, 14) constituting a front optical surface S1,
- the second layer (3, 13), at least 200 micrometers thick, of a second polymeric material forms a rear part of said lens and has a rear face (6, 16) constituting a rear optical surface S2, and
- the interface (5, 15) between these two layers constitutes an optical surface S3 and is parallel to the rear face (6, 16) of the second layer (3, 13).
Ophthalmic lens according to any one of the preceding claims, characterized in that the rear optical surface S2 is a spherical optical surface.
Ophthalmic lens according to any one of the preceding claims, characterized in that the thickness of the first layer (2, 12) forming the front part of the lens possesses a thickness at the centre of 0.2 to 10 mm.
Ophthalmic lens according to any one of the preceding claims, characterized in that the second layer (3, 13) forming the rear part of the lens possesses a thickness at the centre of 0.2 to 1 mm.
Ophthalmic lens according to any one of the preceding claims, characterized in that the refractive index of the first polymeric material is higher than or equal to 1.65, preferably higher than 1.67 and, better still, equal to or higher than 1.7.
Ophthalmic lens according to any one of the preceding claims, characterized in that the first polymeric material is a material containing sulphur, such as polythiourethanes and episulfide polymers.
Ophthalmic lens according to any one of the preceding claims, characterized in that the second polymeric material is selected from the poly (allyl carbonates), the polyurethanes, the polythiourethanes, the polycarbonates.
Ophthalmic lens according to any one of the preceding claims, characterized in that it comprises an anti-abrasion coating deposited on at least one of the front (4, 14) and rear (6, 16) faces constituting, respectively, the front S1 and rear S2 optical surfaces.
Ophthalmic lens according to any one of the preceding claims, characterized in that the second layer (3, 13) forming the rear part of the lens is a preform, on the front face of which the first layer (2, 12) of the first polymeric material has been hardened.
Dependencies are inferred from the claim text.