A coating formulation containing at least one surface-modified silicon dioxide having a 60\xb0 reflectometer value of<3 and a black number My of at least 140 has excellent performance properties, for example, a very good transparency. The detachable shelter frame includes a shelter frame for supporting two auxiliary lenses and a pair of magnetic attachment arrangements connected to the shelter frame. The first substrate includes a color filter. The user may select a highlighted feature by actuating the dimmer’s control switch. Gas pressure based pattern recognition can be used to identify, optionally during treatment and in real time, one or more leak sites responsible for the leakage.