Essilor International

Essilor International (Compagnie Generale D'optique)

Francisco De Ayguavives

Olivier Pophillat

Herve Cado

Hervé Cado

Karl Citek

Gabriel Keita

Gilles Baillet

Hélène Maury

Helene Maury

Pierre Fromentin

Alexis Theoden

Nicolas Maitre

Dominique Rychel

Ilya Bolshakov

Xiaohong Zhang

William Trottier-Lapointe

Berangere Penaud

Andrew Rosales Pelayo

Gérard Willemin

Luc Nouvelot

Thanisararat Saleesung

Ker Chin Dave Ang

Frèdèric Arrouy

Andrew Pelayo

Ivan Dieguez

This optical device comprises an ophthalmic lens and a light source emitting in the deep red and near infrared region. The ophthalmic lens has front and rear faces coated with interferential coatings. The mean reflectance of the rear interferential coating is lower than or equal to 2.5% for wavelengths ranging from 700 nm to a predetermined maximum wavelength lower than or equal to 2500 nm, at an angle of incidence lower than or equal to 45°. At an angle of incidence lower than or equal to 45°, for wavelengths ranging from 700 nm to the predetermined maximum wavelength, the mean reflectance of the front interferential coating is either lower than or equal to 2.5% if the source is directed towards the front face of the ophthalmic lens, or higher than or equal to 25% if the source is directed towards the rear face of the ophthalmic lens.

Optical device with reduced reflection in deep red, near infrared and visible ranges

The invention relates to an optical article having a substrate made of an optical material comprising a polymer matrix and an improved light transmission in the visible range. The substrate comprises an external layer in which particles are embedded into the polymer matrix, the refractive index of the particles Rbeing lower than the refractive index of the polymer matrix R.

Optical article comprising a substrate with embedded particles for light transmission enhancement

The present invention relates to an optical lens comprising a substrate with a front main face and with a rear main face, at least one of the main faces being coated with an antireflection coating, such that in the range [0&#xb0;-50&#xb0; ] of angles of incidence &#x3b8;, the mean light reflection factor Rv(&#x3b8;) on said coated main face presents a minimum value Rvfor an angle of incidence &#x3b8;, comprised in the range [20&#xb0;-50&#xb0; ], and Rv/Rv(15&#xb0;)&#x3c;0.95, Rv(15&#xb0;) being the mean light reflection factor for an angle of incidence &#x3b8; of 15&#xb0; on said coated main face. The optical lens is also useful to inhibit reflection of light in the ultraviolet range.

Optical lens comprising an antireflective coating with multiangular efficiency

An ophthalmic tinted glass () comprises a substrate-forming base eyeglass (), a first layered structure () which covers a convex face (Cx) of the base eyeglass, and optionally a second layered structure () which covers a concave face (Cc) of the base eyeglass. The first layered structure has a function of selective reflection increase, and the second layered structure is antireflective. Such ophthalmic tinted glass produces solar protection while having a mean transmittance value in a wavelength range from 460 nm to 10 nm, or 465 nm to 495 nm, which is high enough for avoiding biological, hormonal and behavioural disorders for a wearer of the tinted glass.

Ophthalmic tinted glass

The invention relates to an optical article comprising a substrate having at least one main face successively coated with a monolayer sub-layer having a thickness higher than or equal to 100 nm, a multilayer interferential coating comprising a stack of at least one high refractive index layer having a refractive index higher than 1.55 and at least one low refractive index layer having a refractive index of 1.55 or less, wherein the ratio is higher than or equal to 2, the outermost high refractive index layer(s) of the interferential coating do(es) not comprise TiO, and the outermost low refractive index layer(s) of the interferential coating is (are) deposited without ionic assistance. 

Optical article having an abrasion and temperature resistant interferential coating with an optimized thickness ratio of low and high refractive index layers

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 ophthalmic lens having a main front face and a main rear face includes: an element for cutting off ultraviolet (UV) light incident on the main front face of the ophthalmic lens; an anti-reflection coating on the main rear face of the ophthalmic lens, having a weighted average reflection factor in the UV region of less than or equal to 7%; and at least one element for at least partially blocking the blue light in the wavelength region from 400 to 460 nanometers, preferably from 420 to 450 nanometers.

Ophthalmic lens

This invention relates to an ophthalmic lens comprising a transparent substrate with a front main face and with a rear main face, at least one of the main faces being coated with a multilayered antireflective coating comprising a stack of at least one layer having a refractive index higher than or equal 1.5 and at least one layer having a refractive index lower than 1.5, such that:&#x2014;the mean light reflection factor in the visible region Ris lower than or equal to 0.5% for an angle of incidence lower than 35&#xb0;;&#x2014;the Chroma C* is equal or higher than 18, preferably 20, according to the international colorimetric CIE L*a*b* for an angle of incidence (&#x398;) of 15&#xb0;.

Optical article comprising an antireflective coating with a very low reflection in the visible region

The present invention is drawn to an optical article comprising: (a) a photochromic substrate comprising at least one photochromic dye, and (b) an interference coating having a specific gradient thickness providing for a gradient reflectance. It also pertains to a process for making such an optical article.

Optical article with gradient photochromism

An index value is calculated for rating an eyeglass with respect to protection against UV hazard. The index value is based on an integrated UV transmission value through the eyeglass and an integrated UV reflection value related to a back face of the eyeglass. Thus, the index value takes into account actual wearing conditions where UV eye exposure is due either to transmission through the eyeglass or reflection on the eyeglass back face. Respective index values obtained for a set of eyeglasses allow easy sorting of the eyeglasses with respect to UV protection efficiency.

Eyeglass rating with respect to protection against UV hazard

An ophthalmic lens having a front and back face, at least one including a filter, which provides the main face/filter with the following properties:

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

Francisco De Ayguavives