Must be working because I'm noticing my eyes starting to be able to water now which they've not done in years. Also the 'screen buzz' on the back of the eyes is diminished at the end of the day when closing eyes. Only issue is that the rubber 'foot' on one of the clips is a little loose, and I have to keep ensuring it's pushed on. They are rather fiddly to remove, clean and replace but that's acceptable since they do clip on nicely without marking my reading glasses, and the clip mechanism does appear to have integrity and work well. I can leave them attached to my reading glasses and put the whole set up in the glasses case so that's a bonus not having to keep clipping & unclipping.