[ElementsActive] Blue Light Cut Glasses for PC, Lightweight, 99.5% Cut. A major advantage is that they can be worn over existing glasses. I purchased these, but the field of vision changes to such a dark color that I felt, "I don't need to go this far to cut blue light." I feel like it might be unhealthy. I recommend not buying them. Because of the large size, there is no suitable case, so I will package them with bubble wrap for shipping. Thank you for looking.