Essilor International

Essilor International (compagnie Generale D'optique)

Olivier Pophillat

Francisco De Ayguavives

Herve Cado

Stephane Gueu

Stéphane Gueu

Hervé Cado

This invention relates to an ophthalmic lens with a low reflection both in the ultraviolet region and in the visible region, comprising a substrate provided on its rear main face with a multilayered antireflective coating (3-7 layers) comprising a stack of at least one layer with a high refractive index and at least one layer with a low refractive index, having a mean reflection factor on the rear face in the visible region Rlower than or equal to 1.15%, a mean light reflection factor on the rear face in the visible region Rlower than or equal to 1%, a mean reflection factor Ron the rear face between 280 nm and 380 nm, weighted by the function W(&#x3bb;) defined in the ISO 13666:1998 standard, lower than 5%, for angles of incidence of 30&#xb0; and 45&#xb0;, the antireflective coating outer layer being a silica-based layer. The lens according to the invention does especially prevent the reflection of the UV radiation produced by light sources located behind the wearer.

Optical article comprising an antireflective coating with a low reflection both in the ultraviolet region and in the visible region

An eyeglass support is adapted for pinch-holding the eyeglass () between three first contact portions (-) and three second contact portions (-). The first contact portions form a height reference for positioning the eyeglass whereas the second contact portions ensure application of the eyeglass against the first contact portions while conforming to any possible shape for the eyeglass. The support suits for being incorporated in a reflection measurement apparatus. In particular, it is useful for measuring reflection of eyeglasses provided with antireflecting coatings or for rating a protection against UV hazards which is provided by an eyeglass to a wearer of the eyeglass.

Support, apparatus and method for performing a reflection measurement on an eyeglass

This invention relates to an ophthalmic lens with a low reflection both in the ultraviolet region and in the visible region, comprising a substrate provided on its rear main face with a multilayered antireflective coating (3-7 layers) comprising a stack of at least one layer with a high refractive index and at least one layer with a low refractive index, having a mean reflection factor on the rear face in the visible region R m lower than or equal to 1.5%, a mean light reflection factor on the rear face in the visible region R v lower than or equal to 1%, a mean reflection factor R UV on the rear face between 280 nm and 380 nm, weighted by the function W(1) defined in the ISO 13666:1998 standard, lower than 5%, for angles of incidence of 30&#xb0; and 45&#xb0;, the antireflective coating outer layer being a silica-based layer. The lens according to the invention does especially prevent the reflection of the UV radiation produced by light sources located behind the wearer.

Growing community of inventors

Charenton-le-Pont, France

Olivier Pophillat