The most important feature of these glasses is that the top part, where the camera is, does not have a hole. Therefore no dust particles can gather and create problems in the future. A common issue with glasses thaqt have holes. It does the job quite well. I cannot say it doesnt smudge at all, there is some fingerpring allowance here and there. No big deals though. There is also some slight "rainbow" effect happening depending on the angles you look at it but again, in general its a perfect solution for someone who wants full coverage of their screen.