The present invention provides a visual function disorder improving agent containing a compound having Rho kinase inhibitory activity, particularly –N–4-benzamide, as an effective component. A client component and a server component each store distinct cryptographic keys needed to access encrypted data on the client. after the mask process is performed. The first and second colors are superimposed and coextensive. The catheter can be positioned to produce hypothermia in a selective area of the body or alternatively positioned to systemically cool the entire body system. The device may be provided within the interior of a larger door, or as a door insert adapted to be incorporated into an existing door.