[Reversible mydriasis and cycloplegia after isocyanate exposure]

We saw three patients working in the production of polyurethanes, who showed mydriasis and cycloplegia of unknown origin. In one patient there was also a transient opacification of corneal stroma. After discontinuation of working both mydriasis and cycloplegia resolved completely within 3-5 days. Because of the history and the analysis of chemical reactions involved in the production of polyurethanes there is strong evidence that both mydriasis and cycloplegia have been caused by topical and (/or) systemic intoxication with the aryl diet of the isocyanate molecule.