Asteroid Hyalosis, Posterior Vitreous Separation

In asteroid hyalosis, accumulations of calcium soaps dispersed throughout the vitreous produce bright echoes in the usually echolucent vitreous. The appearance of asteroid hyalosis should not be confused with that of vitreous hemorrhage or vitritis. Many of the larger aggregates in asteroid hyalosis are easily seen as the gain is reduced to below 60 db, unlike vitreous hemorrhage or vitritis which usually disappears at low gain settings. There is also an area of clear echolucent vitreous between the posterior hyaloid face and the asteroid particles, which is usually not present in vitreous hemorrhage or vitritis.