Kensington Anti Glare Computer Screen Filter - Anti-Glare and Blue Light Reduction Monitor Filter for 21.5 inch Monitors, Glare & Reflection Reducing Screen Protector, Improves Clarity (627555)Reduces Glare and Blue Light Anti glare coating reduces reflection and improves clarity (matte side only). Eliminates blue light by up to 43 Percent, easing eye strain and reducing chance of interrupted sleep Antimicrobial Coating (matte side only) Anti glare screen features a coating that inhibits bacteria growth by up to 99 Percent (tested to JIS Z 2801 : 2010E for Escherichia coli and Staphylococcus aureus) Easy Installation, Removal and