Pseudopterygium from exposure to selenium dioxide.

Pseudopterygium and symblepharon developed in a patient exposed to selenium dioxide gas. Previously, a case of pseudopterygium had been reported after exposure to seleniferous acid. This cicatricial condition can be distinguished from the pterygium by eccentric location, the lid scarring, and the absence of pterygium in the other eye. This pseudopterygium recurred despite 11 operations. Full-thickness mucous membrane grafts wee used to separate the lid from the globe.