Hemifacial Spasm in an Argus II Retinal Prosthesis Patient

Susan Sun, Danny A. Mammo, Dara D. Koozekanani, Sandra R. Montezuma

Research output: Contribution to journalArticlepeer-review


Purpose: A 59-year-old man with retinitis pigmentosa, who received an Argus II retinal prosthesis in the left eye 3 years prior, presented with left-sided involuntary facial contractions that occurred only after turning on the Argus II device. Methods: A case report. Results: Given that this patient's reported and visualized lower eyelid twitching corresponds to the location of the external region of the implanted coil, we hypothesize that heat or wirelessly transmitted electrical signals from the external coil to the implanted coil may induce spasm of the facial nerve and thus play a role in hemifacial spasm onset. Conclusions: To our knowledge, this is the first report of hemifacial spasm associated with Argus II use.

Original languageEnglish (US)
Pages (from-to)325-326
Number of pages2
JournalJournal of VitreoRetinal Diseases
Issue number4
StatePublished - Jul 1 2020

Bibliographical note

Publisher Copyright:
© The Author(s) 2019.


  • Argus II
  • hemifacial spasm
  • retinal prosthesis


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