For exclusive use. 2-way glasses "Zoff+Concentration" with detachable hood to create a focused environment. It cuts out unnecessary visual information and reduces the load on the brain's "frontal eye field" (the part of the brain that controls eye movement). It can also be used as regular sunglasses, and by attaching the included frame, you can block the surrounding view and increase concentration. ZN201015A-49A1 (Demi pattern)