Patent ID: 6145984
Filing Date: 2000-11-14
Classification: G02C

Abstract:
A lens comprising a front lens element and a rear lens element,each said lens element having a convex surface on one side and concave surface on the other side thereof,at least one of said lens elements comprising a trichroic contrast enhancer,said lens elements being adhered together with a light-polarizer disposed between said lens elements,front and rear exterior surfaces of said lens being defined by said convex surface of said front lens element and said concave surface of said rear lens element, respectively, andsaid trichroic contrast enhancer:a) providing maximum light transmission with respect to CIE illuminant C at three or more points (hereinafter ""maxima""), at least one of said maxima being located within each of three maximum-transmission wavelength bands defined by respective spectral ranges of 610-650 nm, 480-520 nm, and 420-460 nm, each of said maxima having a light transmission value at least 125% of the integrated visible-light transmission value of said trichroic contrast enhancer, b) providing minimum light transmission with respect to CIE illuminant C at two or more points (hereinafter ""minima""), at least one of said minima being within each of two minimum-transmission wavelength bands defined by spectral ranges located chromatically between the spectral ranges defining said maxima,wherein the value of the highest of said maxima in each of said maximum-transmission bands is equal to 80% to 120% of the average value of the three highest of said maxima, andwherein the lowest value of said minima in each of said minimum-transmission bands is 75% or less of the value of the integrated visible-light transmission value of said lens.