Optic Nerve Squeezebox PM Sunglasses (Shiny Black, Photomatic Brown2Brown) Nylon Resin Frame Optic Nerve Squeezebox PhotoMatic Sunglass, nylon with Impact resistant lenses to protect your eyes from foreign objects Optimum Uses: Extreme. Optimum Face Shape: Slightly Narrow Photochromatic Lens offers the functionality of interchangeable lenses with out the hassle of changing them 100% UVA/UVB Protection to protect your eyes from harmful UV rays Shiny Black Frame/Brown2Brown Photomatic Lens