As a chronic migraine sufferer I struggle with getting my bedroom dark enough so when I saw these on Amazon (at such a great price) I figured what have I got to loose? I’m glad I bought them because they do work as intended. I thought they were easy to apply and I even gave some to my mom (who is also a migraine sufferer). While they don’t completely black out the light they definitely make it more tolerable and eliminate any glare from the light. I will say they seem to work better on white and blue lights better than red.