Two cases of asteroid hyalosis in the dog are described. Asteroid hyalosis is a rare degenerative phenomenon in the vitreous body. Ophthalmoscopically it is characterized by spherical, small bodies which gleam brilliantly in the vitreous like stars in the night sky. Histochemically these spherical bodies are a calcium-lipid complex. The etiology of asteroid hyalosis is unknown. The condition usually does not give rise to symptoms and can not be influenced by conservative treatment.