Ophthalmic lens having increased resistance to hot and humid environment
AssigneesCorporation De L'ecole Polytechnique De Montreal, Essilor International
InventorsMartin Caron, Karin Scherer, Oleg Zabeida, Ludvik Martinu, Jolanta Klemberg-Sapieha, Thomas Schmitt
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Abstract
The invention concerns an ophthalmic lens having an increased resistance to thermal and hygroscopic stresses, said ophthalmic lens comprising a substrate, at least one main face of which is coated with a siloxane-based anti-abrasion hardcoat, characterized in that said ophthalmic lens further comprises at least one protective layer of an organic-inorganic material directly in contact with said hardcoat, said protective layer of organic-inorganic material having a Young's modulus higher than 20 GPa, preferably of at least 25 GPa.
Claims20
An ophthalmic lens having an increased resistance to thermal and hygroscopic stresses, said ophthalmic lens comprising a substrate, at least one main face of which is coated with a siloxane-based anti-abrasion hardcoat, wherein said ophthalmic lens further comprises at least one protective layer of an organic-inorganic material directly in contact with said hardcoat, said protective layer of an organic-inorganic material having a Young's modulus higher than 20 GPa.
A process for increasing the resistance to thermal and hygroscopic stresses of an ophthalmic lens comprising a substrate, at least one main face of which is coated with a siloxane-based anti-abrasion hardcoat, comprising:
- depositing directly on said hardcoat a protective layer of an organic-inorganic material having a Young's modulus higher than 20 GPa.
Dependencies are inferred from the claim text.