OPHTHALMIC ARTICLE IN PARTICULAR FOR SUNGLASSES

• Main Authors: PONOT, Solange, SCHIANCHI, Natalia
• Format: Patent
• Language: English; French; German
• Published: 18.10.2023
• Subjects: CONTACT LENSES; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS; SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURESAS SPECTACLES

The invention relates to an ophthalmic article (1), in particular for sunglasses, comprising at least one substrate (9) and a photochromic filter compound (15), the ophthalmic article (1) having a first transmission spectrum in an activated state of the photochromic filter compound (15) and a second transmission spectrum in a deactivated state of the photochromic filter compound, such that: ⋅-the first and the second transmission spectra at wavelengths lower than 380 nm is lower than 1%, ⋅-the first and the second transmission spectra have a relative first maximum between 460 nm and 510 nm, ⋅-the first and the second transmission spectrum have a relative first minimum between 560 nm and 610 nm, and where ⋅-Tvactivated is the luminous transmittance according to ISO_13666 in the activated state of the photochromic filter compound. ⋅-Tvdeactivated is the luminous transmittance according to ISO_13666 in the deactivated state of the photochromic filter compound. ⋅The lens has a reduced transmission in the blue between 400 and 450 nm and a reduced transmission around 585 nm. The lens provides a good contrast and reduces glare.TvdeactivatedTvactivated>2.5TvactivatedTνdeactivated