The Marcus Gunn phenomenon. Discussion and report of a case.

A detailed clinical description of the Marcus Gunn phenomenon is featured. Related ophthalmologic aberrations associated with mandibular movement are briefly discussed. A report of a case of Marcus Gunn phenomenon, which was significant for a paternal history of bilateral cleft lip and palate, is presented. The general and the dental considerations in the management of this disorder are summarized. Protective eye shields are recommended for use during dental procedures.