Corneal hydrops in Terrien's marginal degeneration.

We present four cases of Terrien's marginal degeneration that developed spontaneous ruptures in Descemet's membrane resulting in corneal hydrops. In all cases, the hydrops was characterized by a clear intracorneal pocket of aqueous humor rather than by stromal clouding. In two cases, the pocket extended peripherally to form a conjunctival filtering bleb. Although a lamellar corneal patch graft was used in one case for severe astigmatism, hypotony, and impending perforation, most cases were merely observed without treatment.