Abstract: An optical element is described comprising an optical part dyed so as to have a curve of the factor of spectral transmittance in a wavelength range comprised between 400 and 700 nm comprising: i) at least one relative maximum at a wavelength comprised between 400 and 510 nm, and ii) at least one relative minimum at a wavelength comprised between 510 and 625 nm, wherein the ratio between the value of the factor of spectral transmittance at said at least one relative maximum and the value of the factor of spectral transmittance at said at least one relative minimum is of at least 1.3, and wherein the ratio between the value of the factor of spectral transmittance at a wavelength of 700 nm and the value of the factor of spectral transmittance at said at least one relative minimum is of at least 3.0.

Abstract: A lens including a polarizing film within a polyurethanic material which comprises a photochromic dye therein.

Abstract: An optical element is disclosed comprising at least one transparent eye-protecting portion comprising a plastic material, preferably having a hardness within a range of about 40 Shore A to about 77 Shore D, as measured according to ASTM Standard D2240, and an elongation at break within a range of about 200% to about 700%, as measured according to ASTM Standard D638.

Abstract: A polarized optical element comprising a polarized optical part is dyed so that the optical part exhibits a curve of spectral transmittance in a wavelength range comprised between 400 and 700 nm comprising: i) at least one relative maximum at a wavelength comprised between 400 and 510 nm, and ii) at least one relative minimum at a wavelength comprised between 510 to 625 nm, wherein the ratio between the value of the factor of spectral transmittance at said at least one relative maximum and the value of the factor of spectral transmittance at said at least one relative minimum is of at least 1.3, and wherein the ratio between the value of the factor of spectral transmittance at a wavelength of 700 nm and the value of the factor of spectral transmittance at said at least one relative minimum is of at least 3.0.

Abstract: An optical element is disclosed comprising at least one transparent eye-protecting portion comprising a plastic material, preferably having a hardness within a range of about 40 Shore A to about 77 Shore D, as measured according to ASTM Standard D2240, and an elongation at break within a range of about 200% to about 700%, as measured according to ASTM Standard D638.

Abstract: A lens is provided comprising a substrate, a first dielectric layer comprising a first dielectric material uniformly covering an outer surface of said substrate, a second dielectric layer comprising a second dielectric material uniformly covering said first metal layer, a metal layer comprising a metal material gradiently covering only a portion of said second dielectric layer and a third dielectric layer formed of a third dielectric material gradiently covering said metal layer.

Abstract: A lens is provided comprising a substrate, a first metal layer comprising a first metal material uniformly covering an outer surface of said substrate, a first dielectric layer comprising a first dielectric material uniformly covering said first metal layer, a second metal layer comprising a second metal material gradiently covering only a portion of said first dielectric layer and a second dielectric layer formed of a second dielectric material gradiently covering said second metal layer.

Abstract: A lens is provided comprising a substrate, a metal layer comprising a metal material uniformly covering an outer surface of said substrate, a first dielectric layer comprising a first dielectric material uniformly covering said metal layer and a second dielectric layer comprising a second dielectric material gradiently covering only a portion of said first dielectric layer.

Abstract: A plano-convex optical sheet having a positive power including: a substantially planar inner surface; opposed lateral edges, and a thickness s that is decreasing proceeding from a transversal central line passing through the geometric center of the optical sheet towards said opposed lateral edges along a portion of predetermined width w of the optical sheet, so as to define a convex outer surface having a curvature such that the optical sheet is capable of providing once bent a cylindrically shaped optically correct visor.

Abstract: A lens is provided comprising a substrate, a first metal layer comprising a first metal material uniformly covering an outer surface of said substrate, a first dielectric layer comprising a first dielectric material uniformly covering said first metal layer, a second metal layer comprising a second metal material gradiently covering only a portion of said first dielectric layer and a second dielectric layer formed of a second dielectric material gradiently covering said second metal layer.

Abstract: A lens is provided comprising a substrate, a first dielectric layer comprising a first dielectric material uniformly covering an outer surface of said substrate, a second dielectric layer comprising a second dielectric material uniformly covering said first metal layer, a metal layer comprising a metal material gradiently covering only a portion of said second dielectric layer and a third dielectric layer formed of a third dielectric material gradiently covering said metal layer.

Abstract: A lens is provided comprising a substrate, a metal layer comprising a metal material uniformly covering an outer surface of said substrate, a first dielectric layer comprising a first dielectric material uniformly covering said metal layer and a second dielectric layer comprising a second dielectric material gradiently covering only a portion of said first dielectric layer.

Abstract: A lens having a substrate, a metal layer uniformly covering one side of the substrate, a first dielectric layer uniformly covering the metal layer, and a second dielectric layer gradiently covering only a portion of the first dielectric layer.

Abstract: A plano-convex optical sheet having a positive power including:

Abstract: The present invention is concerned with a new family of optical element for use in eyeglasses, visors, masks and screens which produce a new chromatic effect through a vacuum deposition of two or plus layers of dielectric substances and methods of manufacturing the same. These new filters combine some colored reflection on the outer surface with a uniform transmission looking through the lens so complying the European Standard in terms of luminous transmittance uniformity.

Abstract: A lens including a polarizing film within a polyurethanic material which comprises a photochromic dye therein.

Abstract: A lens having a substrate, a metal layer uniformly covering one side of the substrate, a first dielectric layer uniformly covering the metal layer, and a second dielectric layer gradiently covering only a portion of the first dielectric layer.

Abstract: A method of forming a mark on a substrate made of plastics material comprises the step of applying a basic solution to a surface portion having a prefixed pattern of the substrate. In a preferred embodiment, the basic solution is used in combination with at least one alkali-stable water-soluble polymer, to produce a viscous liquid composition, which is advantageously applicable to the substrate by means of pad-printing and silk-screen printing process.

Abstract: An optical element is disclosed comprising an upper portion (9) and a lower portion (8) defined in opposite parts with respect to a median line (x--x) passing through the geometric center (C.sub.1, C.sub.2) of the optical element, wherein the factor of luminous transmittance is between 30% and 80% in the lower portion (8) and between 3% and 40% in the upper portion (9). Advantageously, furthermore, the curve of spectral transmittance as a function of the wavelength in the lower portion (8) and at a distance of at least 10 mm from the median line (x--x) is such as to show: a minimum in a wavelength range of from 495 to 510 nm, ii) an increase in spectral transmittance at wavelengths lower than 495 nm and higher than 510 nm, iii) a maximum at a wavelength lower than 440 nm, iv) a reduction in the spectral transmittance as the wavelength decreases starting from said maximum.

Abstract: An optical element for use in eyeglasses, visors, masks and screens to reduce the image perception time and improve the countour definition of the image comprises a transparent plastic material supporting member into which there is introduced, by suitable processing operations, 4-nitro-2-methyl-4-diethanolamino-azobenzene having the following formula ##STR1##