I love these. Those of us that are have Presbyopia, which is all of us over 45 or so, know that your life is suddenly glued to reading glasses. And while your eye doctor will suggest you buy from his optician because both of your eyes are not quite the same, mostly this is nonsense and off the shelf readers would do fine. So you go to costco and buy a 10 pack of 1.5 or something like that. After a few years, you realize what a nuisance this is and you discover the wonderful world of Clic. Clic hangs around your neck all the time and just bring them up to your eyes and the snap together magnetically. My clics are on my neck from the time i get dressed til the time i go to bed. You cant lose or displace them. The one negative is that it is not easy to put on if only one hand is free. It is a two hand task Now i do prefer the kind that is adjustable frond to back, as these are. The ones that are fixed do not fit perfectly. On the other hand there are versions that have an adjustable width in the back. This is a failure point and two pairs have broken there. Absent that they last as long as your eyes can use them before having to increase the strength. The pair i just bought is a back up. Sitting until i need it.