Abstract: A device for automatically measuring characteristics of an ophthalmic lens (L1), includes: a support (2) designed to receive such a lens; on one first side of the lens support, illuminating elements (208) including an optical system for producing a light beam directed towards the ophthalmic lens mounted on the support; and on a second side of the support, elements for analyzing (210) the image transmitted by the ophthalmic lens mounted on the support and illuminated by the illuminating elements (208); elements for splitting the light beam including a first mask (220) forming a Hartmann array and arranged on the first side of the lens support to be illuminated, upstream of the lens by the light beam.

Abstract: A method of centering a target ophthalmic lens presenting a known shape on a target rimless frame, includes identifying the pupillary point on the presentation lens of a presentation frame identical to the target frame, measuring the pupillary height and the pupillary half-distances of the pupillary points, identifying the optical frame of reference of the target lens, transferring the pupillary height and the pupillary half-distances onto the target lens, and deducing the centering position of the target lens. For the presentation lens presenting an outline different from the outline that the target lens will have after edging, the measurements on the presentation lens are taken in a frame of reference associated with the presentation lens, and the position of the target lens is deduced in a frame of reference associated with the target frame.

Abstract: The present invention relates to an apparatus for conforming a functionalized flexible planar film on an optical lens. The apparatus according to the invention may also be used in a process of functionalization of an optical lens. As a factor of the functionalization that one wishes to introduce into said optical lens and the nature of the functionalized flexible planar film used, the functionalization process is a process of gluing, transfer, or molding of a functionalized flexible planar film onto an optical lens. The implementation of each of these respective processes makes it possible to obtain a functionalized optical lens, said functionalization being adhered, transferred, or molded using a functionalized flexible planar film.

Abstract: A progressive multifocal ophthalmic lens has a complex surface having a prism reference point, a fitting cross, a progression meridian having a power addition greater than or equal to 1.5 diopters. The lens has, under conditions when being worn: a reduced root mean square, normalized to the addition prescription, of less than 0.65 microns per diopter in a zone delimited by a circle centred on the prism reference point and with a diameter corresponding to a sweep of vision of 80°, a progression length of less than or equal to 25°, and a difference in normalized reduced root mean square between pairs of symmetrical points relative to a vertical axis passing through the fitting cross of less than 0.12 microns per diopter in a zone delimited by a semi-circle centred on the fitting cross and with a radius corresponding to raising viewing by 25°.

Abstract: An optical component (10) comprises a transparent set of cells (15; 25) juxtaposed in parallel to a surface of the component. Each cell is hermetically sealed and contains a substance with an optical property. The set of cells comprises cells of several sizes. The size of the cells can be varied between various locations of the surface of the component (10), for making it possible to cut out the component without altering its optical properties. Furthermore, the variation in size of the cells serves to prevent diffraction or scattering from being visible in certain zones of the component.

Abstract: The method comprises emitting appropriate polarisation light waves on a photosensitive material for inducing therein a topographic modification through an aperture of at the most 100 mm bound by an opaque area, said layer being arranged at the most 100 mm away from the aperture.

Abstract: A polishing machine for optical elements, comprising: a spindle arranged to rotationally drive an optical element; a polishing tool mobile relative to the spindle; a front face provided with a door enabling the access to the spindle and to the polishing tool; wherein the polishing tool is mounted on a body which is rotationally mounted on sliding means by way of a first axis, the sliding means being substantially perpendicular to the front face.

Abstract: An ophthalmic lens comprises a transparent substrate and electro-optical means integrated with the substrate to perform an optical function in response to an electrical stimulus. The ophthalmic lens further comprises at least one photovoltaic cell integrated with the substrate to power the electro-optical means in response to an incident light, and optionally also a control circuit for controlling the electrical voltage. The photovoltaic cell may be incorporated in an opaque element occupying a small fraction of the area of the lens. Alternatively, the photovoltaic cell may be transparent and may cover at least a portion of the area of the lens.

Abstract: A method of improving an initial color filter comprises a numerical generation of sinusoidal spectra. Two steps of selecting said spectra are then executed. The first selection is carried out according to a criterion of calorimetric similitude with respect to the initial filter. The second selection is carried out according to the capacity of dummy filters corresponding to each spectrum to restore hues in a natural manner. To do this, observations of samples of hues through each dummy filter are simulated numerically, using a color appearance model to take account of a visual perception of a human observer. In this way, an improved filter is determined, which has a color close to that of the initial filter and which affords a natural rendition of hues.

Abstract: Curable composition comprising: (a) one or more particular polyisocyanates or a polyurethane prepolymer obtained by the polycondensation of a polyisocyanate in excess, chosen from said polyisocyanates, with one or more polyols comprising at least two free alcohol functional groups, chosen from polypropoxylated or polyethoxylated bisphenol A compounds and polyfunctional polycaprolactone-alcohols; (b) one or more polyols comprising at least two free alcohol functional groups, chosen from polypropoxylated or polyethoxylated bisphenol. A compounds and polyfunctional polycaprolactone-alcohols, and polyurethane prepolymers obtained by the polycondensation of one or more polyols in excess, chosen from the above polyols, with one or more particular polyisocyanates, the ratio of the number of isocyanate functional groups of the polyisocyanate component (a) to the number of alcohol functional groups of the polyol component (b) being between 1.00 and 1.

Abstract: This invention relates to a method for preparing a photochromic latex, photochromic thin films obtained therefrom, and articles coated with such thin films, in particular photochromic ophthalmic lenses.

Abstract: Methods are disclosed which utilize polycarbonate to form solid optical lenses. The polycarbonates may be selected from high molecular weight linear or branched species. Viscosity and melt flow are specified for improved mechanical properties. The method provides lenses with greater resistance to cracking and crazing, for example, in instances where flaws are subject to strain and require containment.

Abstract: The invention concerns a method which comprises irradiating at least one face of an article with UV radiation, causing the article to be photodegraded over a thickness of at least 1 ?m and contacting the irradiated face of the article with a coloring agent, so as to diffuse the coloring agent in the entire thickness of the photodegraded surface layer of the article. The invention is useful for optical and ophthalmologic articles.

Abstract: The present invention relates to room temperature or thermally polymerizable/curable episulfide based compositions for making polymerized/cured episulfide based resins, and in particular episulfide based compositions which can be fastly polymerized/cured, as well as to a room temperature or thermal polymerization process for making such episulfide based resins.

Abstract: The invention relates to a method for forming from a mold optical articles. These methods are particularly useful in preparing ophthalmic articles such as ophthalmic lenses, having several optical coatings thereon. The invention also relates to ophthalmic articles produced by these methods.

Abstract: The invention relates to a method for forming from a mold optical articles. These methods are particularly useful in forming ophthalmic articles such as ophthalmic lenses, having a hydrophobic top coat thereon. Ophthalmic articles produced by these methods are also part of the invention.

Abstract: A method of fast curing polythiourethane transparent casted substrate, usable for making optical articles such as ophthalmic lenses, which comprises the steps of: 1) Providing a first component A comprising a polythiourethane prepolymer having isocyanate or isothiocyanate end groups and a viscosity at 25° C. ranging from 0.02 to 0.4 Pa.s; 2) Providing a second component B comprising a polythiourethane prepolymer having thiol (SH) end groups and a viscosity at 25° C. ranging from 0.2 to 2.0 Pa.s; 3) Mixing together first and second components A and B and filling a moulding cavity of a casting mould assembly with the resulting mixture; 4) Curing said mixture to obtain a transparent solid substrate, said curing step comprising: a) a first step for polymerizing said mixture to obtain a gel within 1 to 10 minutes; and b) a second step of post-curing the gel to obtain the transparent solid substrate; and 5) Recovering the transparent solid substrate from the mould.

Abstract: A device for automatically detecting characteristics of an ophthalmic lens includes a support receiving the lens, an illumination system and an analysis system. The optics of the illumination system define two alternate optical paths, one of which passes through a mask forming a Hartmann matrix.

Abstract: The polymerizable compositions comprise: A) at least one polyiso(thio)cyanate monomer, and at least one polythiol monomer; or at least one episulfide compound and optionally one or more compounds having two or more functional groups capable of reacting with episulfide groups; and B) as polymerization catalyst, an effective amount of a salt of formula MmP+Yn? Y? is an anion such as the corresponding acid YH has a pKa fulfilling the condition 0.5?pKa?14 with the proviso that when the polymerizable compositions comprise an episulfide compound and MP+ is an ammonium group, the polymerizable composition also comprises an electro-donor compound. Application to the fabrication of optical articles, such as lenses.

Abstract: A method for molding a plastic ophthalmic lens which comprises introducing a liquid polymerizable composition in a molding cavity of a two-piece mold through a filling nozzle in flow communication with the upper half of the molding cavity and spaced apart from the central vertical axis of the molding cavity up to the time the lower half of the molding cavity is filled. Then, tilting the mold to bring the filling in register with the central axis of the molding cavity and achieving full filling of the molding cavity. Thereafter, polymerizing the composition and recovering the lens.