OPHTHALMIC ARTICLE IN PARTICULAR FOR SUNGLASSES
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...
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Main Authors | , |
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Format | Patent |
Language | English French German |
Published |
18.10.2023
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Subjects | |
Online Access | Get full text |
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Summary: | 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 |
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Bibliography: | Application Number: EP20210836429 |