Lenovo ThinkVision Monitor Privacy Filters utilize the patented 3M microlouver privacy technology to darken the screen at specific angles so as to block the vision of wandering eyes from viewing your screen while you work. This is a key benefit to companies as it provides the first line of defense against visual hacking protecting private information from being hacked by on lookers. Privacy filters also reduce glare from bright backlight panels and overhead lights though that's not its primary function. Another function is that privacy filters guards and protects your screen from scratches and smears keeping your monitor screens safe from unwanted destruction. Privacy Filters for Monitors allow you to work with the peace of mind that your information on your screen is safe from wandering eyesIt ensures the privacy of your clients records in compliance with state & country laws and regulations in industries like finance, consulting, healthcare, government and education (e.g., HIPPA (ensuring PHI), HITECH, NIST,PII (Patient Identifiable Information), ISO, PCI (Payment Card Info) Gramm Leach Biley Act-privacy in finance, Sarbanes-Oxley, CIPA (Children's Internet Protection Act) and several breach notification laws in various statesAll Lenovo Privacy Filters are constructed and built with high-grade optical film to ensure that the user maintains high clarity with no optical distortion.All Lenovo Privacy filters are lightweight and easy to install and includes 3M adhesive strips which allow for easy residue-free removal for multiple on-and-off uses.All Lenovo Privacy Filters utilizes anti-reflective coating to reduce reflection. This improves efficiency by reducing the amount of light lost thereby improving image contrast by eliminating unwanted light sources.