The iris, the colored structure in the front of the eye, is composed of many tiny pigment granules. In everyone some these pigment granules become dislodged from the iris over time. In pigment dispersion syndrome, an abnormally large amount of pigment granules are liberated from the iris. These granules travel on fluid currents inside the eye and ultimately rest on many different intraocular structures. People with pigment dispersion syndrome have a higher likelihood of developing glaucoma.