  The problem of describing optical turbulent structures, arising in resonant
media with high Fresnel numbers, is reviewed. The consideration is based on the
probabilistic approach to pattern selection, ascribing a probability
distribution of patterns to systems with multiple possible structures. The most
probable structure corresponds to the minimal expansion exponent, or to the
minimal expansion rate, characterizing the phase-space expansion of a dynamical
system. Turbulent photon filamentation is studied. The most probable filament
radius and the number of filaments are found, being in good agreement with
experiment.
