Ophthalmic article
The invention relates to an ophthalmic article ( 1 ) in particular for sunglasses, comprising: first layer ( 9 ) made of photochromic cellulose triacetate having a rear face ( 9 R ) to be oriented toward an eye ( 7 ) of a user and a front face ( 9 F ) to be oriented toward the field of vision ( 13 ) of the user, and a second layer ( 10 ) made of polyamide having a rear face ( 10 R ) to be oriented toward an eye ( 7 ) of a user and a front face ( 10 F ) to be oriented toward the field of vision ( 13 ) of the user, the first layer ( 9 ) being disposed proximate to the field of vision ( 13 ) of the user with regard to the second layer ( 10 ) being disposed proximate to the eye ( 7 ) of the user.
1. An ophthalmic article, comprising:
a first layer made of photochromic cellulose triacetate having a rear face to be oriented toward an eye of a user and a front face to be oriented toward the field of vision of the user;
a second layer made of polyamide having a rear face to be oriented toward an eye of a user and a front face to be oriented toward the field of vision of the user;
the first layer being disposed proximate to the field of vision of the user with regard to the second layer being disposed proximate to the eye of the user;
wherein the second layer made of polyamide comprises a first sublayer made of polyamide and a second sublayer made of polyamide;
wherein the sublayer which is closer to the eye of the user is a non-tinted crystal sublayer; and
wherein the sublayer which is further from the eye of the user is tinted by a pigment or a colorant.
2. The ophthalmic article as claimed in claim 1 , comprising a third layer made of polarizing polyvinyl alcohol which is disposed between the first layer and the second layer.
3. The ophthalmic article as claimed in claim 2 , wherein the third layer is linearly polarized.
4. The ophthalmic article as claimed in claim 2 , wherein the third layer has a thickness comprised between 0.01 mm and 1 mm.
5. The ophthalmic article as claimed in claim 1 , wherein said layers are fixed together by thermoforming or by injection molding.
6. The ophthalmic article as claimed in claim 1 , wherein a hard coat is applied on the front face of the first layer.
7. The ophthalmic article as claimed in claim 1 , wherein the rear face of the second layer is surface finished for a corrective effect.
8. The ophthalmic article as claimed in claim 1 , wherein the first layer has a thickness comprised between 0.5 mm and 1 mm.
9. The ophthalmic article as claimed in claim 1 , wherein the second layer has a thickness comprised between 0.02 mm and 1 mm.