Review on 🔵 Enhanced Blue Light Blocking Screen Protector Panel for 20-22 inch LED PC Monitors - Anti-UV Eye Protection Filter Film - Widescreen Frame Hanging Type (W 19.3" X H 12.5") by Jonathan Davenport

Great for a 20" monitor (although slightly taller than the frame). Ease of installation. Just clean your screen, remove the protective films from the blue light filter (front and back), hang the top of your screen. The filter is not adjacent to the monitor screen, so if you replace your monitor with one of the same size (or slightly larger), you can still use the blue light filter. Plus, you don't have to worry about bubbles, and you can easily move the filter back and forth (if needed) to use the power button on your monitor. If you have an external webcam on your monitor, it may still be sitting on top of the blue light filter. I see literally no difference in screen display clarity. Brought the first filter for a friend and was so pleased with the product that I bought another one.