text: I got this item because there is a theory that the blue light emitted by computer and TV screens can interfere with sleep patterns. I believe that I am sleeping better sense I have started using these orange lenses. I find that I need to put them on at least two hours before I go to bed for them to have any effect. If you watch TV or work at a computer screen at night and are having trouble sleeping you might want to give this a try.Tthese clip-on lenses are very inexpensive so you don't have much to loose. I would give these five stars except they tend to cause my glasses to slip down a bit.