High performance selective light wavelength filtering providing improved contrast sensitivity

Abstract

The present invention relates to ophthalmic systems and coatings comprising a selective light wavelength filter, wherein said selective filter provides improved contrast sensitivity.

What is claimed is: 
     
         1 . An ophthalmic system comprising:
 a filter that selectively blocks 10-40% of light in a wavelength range of 420-440 nm;
 wherein the system has an average transmission of at least 80% across the visible spectrum; 
 wherein white light has a CIE of (0.33+/−0.05, 033+/−0.05) when transmitted through the system; and 
 wherein the system has a yellowness index of 15 or less. 
   
     
     
         2 . The system of  claim 1 , wherein the filter selectively blocks 10-30% of light in a wavelength range of 420-440 nm. 
     
     
         3 . The system of  claim 1 , wherein the filter selectively blocks 10-20% of light in a wavelength range of 420-440 nm. 
     
     
         4 . The system of  claim 1 , wherein the filter selectively blocks 5-40% of light in a wavelength range of 420-440 nm. 
     
     
         5 . The system of  claim 1 , wherein the filter selectively blocks 5-30% of light in a wavelength range of 420-440 nm. 
     
     
         6 . The system of  claim 1 , wherein the filter selectively blocks 5-20% of light in a wavelength range of 420-440 nm. 
     
     
         7 . The system of  claim 1 , wherein the system has an average transmission of at least 85% across the visible spectrum. 
     
     
         8 . The system of  claim 1 , wherein the system has an average transmission of at least 90% across the visible spectrum. 
     
     
         9 . The system of  claim 1 , wherein the filter comprises an antireflective component. 
     
     
         10 . The system of  claim 1 , wherein the system further comprises UVA and UVB blocking. 
     
     
         11 . The system of  claim 1 , wherein the filter comprises porphyrin dye and derivatives thereof. 
     
     
         12 . The system of  claim 1 , wherein the filter comprises a film comprising poly vinyl butyral. 
     
     
         13 . The system of  claim 1 , wherein the system has a yellowness index of 10 or less. 
     
     
         14 . The system of  claim 1 , wherein the system has a yellowness index of 9 or less. 
     
     
         15 . The system of  claim 1 , wherein the system has a yellowness index of 7 or less. 
     
     
         16 . The system of  claim 1 , wherein the system has a yellowness index of 5 or less. 
     
     
         17 . The system of  claim 1 , wherein the system causes a maximum color shift of no more than 20 just noticeable difference units in the CIE color space for each tile of the Munsell Color System under a D65 daylight illuminant. 
     
     
         18 . The system of  claim 1 , wherein the system reduces scotopic luminance by less than 15% and photopic luminance by less than 15%. 
     
     
         19 . The system of  claim 1 , wherein the filter is absorptive. 
     
     
         20 . The system of  claim 1 , wherein the filter is reflective.