The small-scale structure of the interstellar cirrus is important since (1) it contains information about the physical processes forming the structure itself and (2) it is a foreground for the cosmic infrared background, and should be separable from that. The investigation of the small-scale structure in the (far-)infrared is difficult, due to the limited available spatial resolution. However, is some well-selected cirrus clouds the visible scattered light and the far-inrared emission is strongly correlated, making it possible to study the structure at a resolution higher than infrared instruments can reach. Here we demonstrate the usability of this method for a sample of northern cirrus clouds and derive parameters describing the small-scale structure.