Blue Light Screen Protector Panel by Accurate Films For 20" and 22" Diagonal LED PC Monitor (W 19.29" X H 12.48") (W490mm x H317mm). Blue Light Blocking up to 100% of Hazardous HEV Blue Light from LED screens. Reduces Digital Eye Strain to benefit eye health. For office or home PC's to promote Healthy Eyes for Working People. For 20"-22" inch diagonal viewing area of your screen.