I work at home and spend many hrs on my computer. So much tension, headaches and squinting. Even using the monitor (1 use 2 big ones) "reduce blue light" in settings, it didnt really work. I started researching for filters and suppliers I found on the internet had mostly negative reviews about the filters. I did a pass. Later it was just necessary to find something. I kept searching and ran across Ocushield, took the gamble and ordered several. After installing them on my large monitors back to work. All of a sudden, maybe an hour into work, I realized the squinting and stress was gone, to the extent I didnt even notice it! I have recommended them to friends who also use tech a lot for business. Well, there you have my review. :)