Unusual Trigger for Contractile Movements of Optic Disc in Peripapillary Staphyloma

PURPOSE: To report a case of contractile movements of the optic disc in peripapillary staphyloma. METHODS: A 65-year-old female received a comprehensive ophthalmic examination, multimodal imaging, and computed tomography. RESULTS: The patient was diagnosed with peripapillary staphyloma in her right eye. Best-corrected visual acuity in her right and left eye was 20/32 and 20/40, respectively, with moderate cataracts in both eyes. Multimodal imaging revealed contractile movements of the optic disc in the right eye that were initiated by the circular rotation of the eye but by none of the triggers previously described in the literature. The patient reported no changes in her vision during contractile movements. Optical coherence tomography revealed a muscle-like structure in the optic disc during the peak of the contraction. Computed tomography did not reveal any abnormality of the optic nerve or the extraocular muscles of the right eye. CONCLUSION: Contractile movements in peripapillary staphyloma may be initiated by previously unknown triggers. The pattern of the contractile movements and optical coherence tomography findings support the muscular nature of these movements.