I purchased these to wear since I work on a computer every day. These prevent me from experiencing any eye strain from having to stare at a computer screen. These are very well made and I will have them for years. They also helped with my sleep . I’ve previously purchased the red lense glasses for my three sons ( 1 green beret, 1 engineer and one HS senior) and they wear them regularly. 2 wear them for sleep optimization and the other to prevent headaches when school went remote ( now he wears them when he plays video games). The marketed blue blocking lenses from the eye dr don’t seem to do anything. The Ra Optics lenses do. I’m glad I finally bought some for myself .