Suspected ciliary block associated with Viscoat use

Ciliary block or malignant glaucoma is thought to be caused by the misdirec tion of aqueous into the vitreous. It is refractory to medical treatment an d often requires vitreous aspiration. We present a case of ciliary block gl aucoma caused by sodium chondroitin sulfate-sodium hyaluronate (Viscoat(R)) gaining access to the vitreous through an unsuspected, small zonular dialy sis. Vitrectomy performed through a peripheral iridectomy resolved this sev ere condition.