LIGHT FILTER DEVICE INCREASING VISION CONTRAST ABILITY AND SHARP NESS VISION DISTANCE UNDER HIGH ILLUMINATION CONDITIONS, LIGHT FILTERING COMPOSITION AND PRODUCTION METHOD Russian patent published in 2004 - IPC

FIELD: medical engineering. SUBSTANCE: device absorbs ultraviolet radiation and reduces blue light radiation intensity. Blue light reduction boundary characterized by value below 0.3% is within the limits of 450- 500 nm. Light filter translucence coefficient for wavelength shorter as 450 nm is less than 0.1% and is equal to 3-30% in light strip of 500-600 nm. Light-filtering organic pigments composition has fine yellow pigment, yellow pigment, blue pigment, scarlet pigment, blue-and green pigment and orange pigment. Method for producing the light filter involves coloring colorless transparent polymer article by plunging the article into hot aqueous solution of organic pigments. Article manufactured from ultraviolet radiation-absorbing polymer is plunged into saturated aqueous solution containing dissolved light-filtering organic pigments composition. EFFECT: significant increase of vision quality. 4 cl, 1 dwg, 3 tbl