(EN) An optical coating comprising a binder and a plurality of porous silica nanoparticles in which the pores are randomly oriented a solution for forming an optical coating comprising a solvent and a plurality of porous silica nanoparticles in which the pores are randomly oriented a method for fabricating an optical coating and the use of porous silica nanoparticles in which the pores are randomly oriented in the manufacture of an optical coating.