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Pigment dispersion syndrome results from idiopathic atrophy of the pigment layers of the iris with liberation of pigment, which is carried forward and deposited along the routes of aqueous flow. Iris atrophy may result in characteristic transillumination of the iris near its base.Pigment is usually present on the posterior capsule of the lens at the site of insertion of the posterior zonular fibres into the ligamentum hyaloideum capsulare. It may be minimal and punctate or dense and confluent in a single or double ring. The zonular fibres may have a bronzelike appearance.' Pigment on the posterior surface of the cornea takes the form of a Krukenberg spindle, with additional punctate or dust-like deposits frequently present on the peripheral corneal endothelium and on the surface of an otherwise normal appearing iris stroma. Pigmentation of the posterior trabeculum is consistently quite dense.

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