This two pack of sunglasses gives you the option to choose either black or white frames. Frames are made of the flexible, durable and lightweight TR-90, making them perfect for use during sports, long drives and other activities. The sunglass frames each come with polycarbonate brown, mirrored lenses which are very comfortable on the eyes and block excess blue light. Ideal for any type of outdoor activity including biking, running, hiking, skiing, gardening, and/or driving. Included in the package is a BONUS orange lens which can be interchanged into either sunglass frame. This orange lens is designed to be used indoors in the afternoon and into the evening to prevent 99% of artificial blue light from entering the eyes. Blue light is emitted naturally in the visible light spectrum from the sun, but modern technology has up exposed to significantly higher levels at wrong times of the day. This increase in exposure to blue light affects our health negatively - primarily through sleep by preventing the release of melatonin. Melatonin is a sleep hormone that allows the body to enter a deep and restful sleep. Blue light stimulates the release of our stress hormone, cortisol, from our adrenal glands which not only keeps us awake but contributes to other health issues like depression, anxiety, obesity, infertility, diabetes even cancer. It is important to block the blue light from our eyes during periods where we would not naturally be exposed to it, i.e. anytime under artificial lighting or while looking at screens from computers, TVs, tablets and/ or phones. Daily use of the orange lens will help reduce sore, dry, tired, painful eyes, headaches, neck pain, fatigue and sleeplessness associated with long days using screens or under artificial lighting. Idea for office or warehouse use. This item comes with two prescription lens inserts to be filled by your optometrist, if needed, and two dust bags.