Optical Clip Evo allows you to mount ophthalmic lenses in the KOO Spectro, Demos and Alibi glasses. INSTRUCTIONS To apply OPTICAL CLIP EVO on your Spectro, Demos and Alibi sunglasses, simply: Place OPTICAL CLIP EVO inside the glasses in correspondence with the special joint placed above the adjustable plates Apply light pressure from above on the central part of the clip until you hear a click. Carefully check that OPTICAL CLIP EVO is fixed and in a central position with respect to the glasses. Optical Clip Evo for sports use and with sun lenses only. Ophthalmic lenses not included.