In general, the disclosure relates to methods and compositions for preparing colorants useful for preparing pigmented hydrogels. The disclosure further relates to pigmented hydrogels comprising the disclosed colorants. In some instances, the colorant is an alcohol extract of an agro-material, such as turmeric, paprika, spinach, and/or woad or the colorants comprise one or more of: a carotenoid, chlorophyll-a, chlorophyll-b, a curcumoid, or indigorubin. Alternatively, the colorant can be carbon black. The disclosure further relates to contact lenses comprising the disclosed pigmented hydrogels.

Dyeing method includes a first step of obtaining a dyeing base body by adhering a base body with a sublimable dye and a sublimable dye carrier, a second step of placing the dyeing base body obtained in the first step to face a resin body and heating the dyeing base body so that the sublimable dye and the sublimable dye carrier which have been adhered on the dyeing base body are sublimated and deposited on the resin body, and a third step of heating the resin body having been deposited with the sublimable dye and the sublimable dye carrier to be fixed with the sublimable dye and the sublimable dye carrier.

The invention discloses a special lens for sports scenes. The lens body has a blue-green absorption layer, an auxiliary absorption layer and a green-red absorption layer. The blue-green absorption layer, the auxiliary absorption layer and the green-red absorption layer are pasted together by glue or fixed together by hot-melt pressing process. The blue-green absorption layer is injection-molded by adding 1.2 g of blue light absorber and 1.04 g of phthalocyanine dye per 100 g of substrate material. The auxiliary absorption layer is injection-molded by adding 2.4 g of phthalocyanine dye and 2.4 g of azo nickel metal compound per 100 g of the substrate material. The green-red absorption layer is injection-molded by adding 1.04 g of azo nickel metal compound and 1.2 g of blue light absorber per 100 g of the substrate material. The invention makes the blue and green colors of the object more vivid and improves the contrast and clarity of the color of the object.

Methods for tinting or decoloring a lens include inserting a lens into a reception unit of a lens holder, providing an immersion bath containing a fluid, immersing the lens holder into the fluid; and rotating the lens holder around a rotation axis to a predetermined maximum rotation angle, wherein the rotation axis is located outside the lens and generally perpendicular to a plane of the lens. A lens obtainable by such methods, a lens having a tint or a decolorization, a lens holder, and a tinting device allowing for more complex (gradient) tints are also disclosed. The present disclosure further relates to a corresponding computer program.

A method of producing an optical article includes applying an imbibition composition having at least one dye onto at least a portion of at least one imbibable surface (45) of a substrate (20) to form a coated substrate (10). The method further includes irradiating at least a portion of the coated substrate with heat from a heat source (80) to form a heat gradient across the coated substrate (10) to diffuse the at least one dye into the imbibable surface to form an at least partially imbibed substrate having a dye concentration gradient corresponding to the heat gradient. The method further includes removing a residual component of the imbibition composition from the at least partially imbibed substrate. The dye concentration gradient forms a gradient pattern upon exposure to actinic radiation.

The invention concerns an article comprising a nanolaminate coating, wherein the nanolaminate coating has a total thickness ranging from 20 to 500 nm and comprises at least one pair of layers constituted of adjacent first and second layers and a minimum of three layers, said first layer being an inorganic silica layer obtained by evaporation of silicon oxide, especially evaporation of SiO.sub.2, and the second layer being a silicon-based organic-inorganic layer obtained by deposition of an organosilicon compound or a mixture of organosilicon compounds under plasma or ionic assistance, and wherein the refractive index of the nanolaminate coating as a whole is lower than 1.58 at 550 nm.

Provided are ink compositions for making cosmetic contact lenses, as well as cosmetic contact lenses and methods for their preparation and use. The ink composition comprises: (a) a colorant; (b) a hydrophilic polymer; and (c) a binder polymer comprising a triblock polymer of formula: [A]-[B]-[C], wherein [A], [B] and [C] are as described herein.

One embodiment of a contact lens includes a lens body configured to fit directly on the surface of the eye and legible characters positioned on the lens body. Another embodiment of a contact lens comprises a lens body including polymeric material and a lens enhancing material (e.g., ink, silicone material, medicament material, and the like) encapsulated in the polymeric material. The lens enhancing material can be in the form of isolated sections distributed in the surrounding polymeric material. Methods of making contact lenses include forming a first lens layer including a first surface, forming a pattern on the first surface, and forming a second lens layer over the pattern.

A method for tinting a spectacle lens substrate includes providing a spectacle lens substrate made from a polymeric lens material, providing a composition having a polymeric carrier material, applying a pattern of the composition on a surface of the spectacle lens substrate, and heating the spectacle lens substrate to allow for diffusion of a dye substance between the carrier material and the lens material. Moreover, a composition for in-substrate tinting of a polymeric spectacle lens substrate and a spectacle lens substrate having a polymeric lens material which exhibits a pattern of a composition having a polymeric carrier material applied on a surface of the spectacle lens substrate are presented.

The present invention relates to an optical element including a base material, a light-shielding film, and a cured film in which an alkyd resin and a melamine resin having two or more iminomethylol groups in a molecule are condensed or in which an alkyd resin and a benzoguanamine resin having two or more iminomethylol groups in a molecule are condensed. The light-shielding film is disposed in at least a part of the periphery of the base material. The cured film is disposed on the surface of the light-shielding film.