I purchased these glasses several months ago, and I love them! By the end of the work day, my eyes would be so tired and strained from my computer and sitting under flourescent lighting all day (with no windows). I had seen these glasses advertised on another web site and decided that if they worked as well as advertised, it would be worth the price. Was it ever! I noticed the difference almost immediately. I rave about them to anyone who will listen and highly recommend to anyone who uses a computer or is stuck under flourescent lighting for extended periods of time.