April 2010
Volume 51, Issue 13
Free
ARVO Annual Meeting Abstract  |   April 2010
Distinguishing Glaucomatous and Retinal Dysfunction Using the mfERG
Author Affiliations & Notes
  • M. K. Menz
    Electrophysiology Laboratory, Electro-Diagnostic Imaging, Inc., Redwood City, California
  • E. E. Sutter
    Electrophysiology Laboratory, Electro-Diagnostic Imaging, Inc., Redwood City, California
  • J. Alvarado
    Ophthalmology, University of California at San Francisco, San Francisco, California
  • Footnotes
    Commercial Relationships  M.K. Menz, Electro-Diagnostic Imaging, Inc., C; E.E. Sutter, Electro-Diagnostic Imaging, Inc., E; Electro-Diagnostic Imaging, Inc., P; J. Alvarado, None.
  • Footnotes
    Support  Allergan
Investigative Ophthalmology & Visual Science April 2010, Vol.51, 3265. doi:
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    • Get Citation

      M. K. Menz, E. E. Sutter, J. Alvarado; Distinguishing Glaucomatous and Retinal Dysfunction Using the mfERG. Invest. Ophthalmol. Vis. Sci. 2010;51(13):3265.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Purpose: : To differentiate retinal from optic nerve dysfunction using the mfERG techniques in patients with abnormal retinal pathology who also showed structural abnormalities typical for glaucoma.

Methods: : Testing was performed on 4 glaucoma patients, 2 patients had diabetic retinopathy and 2 patients with myopic retinal degeneration. Their visual field tests were atypical for glaucoma. One patient with diabetic retinopathy also was on hydroxychloroquine (HCQ) and was suspected of having HCQ induced retinopathy. Outer retinal function was evaluated by means of the standard mfERG protocol. To test inner retinal and ganglion cell contributions to the mfERG, we employed a stimulation mode called the global flash paradigm. It enhances inner retinal response contributions and exhibits a contribution from optic nerve fibers (Optic Nerve Head Component, ONHC). The ONHC was used to evaluate nerve conduction.

Results: : In all 4 patients we could separately identify retinal and optic nerve abnormalities with the mfERG. Example: The patient suspected of having HCQ induced retinopathy showed a central scotoma in the visual field. However the retinal mfERG in this area was within normal range while the ONHC was abnormal. This suggests local optic nerve dysfunction rather than HCQ toxicity as the cause of scotoma.

Conclusions: : Diagnosis of complicated cases that could include both retinal and optic nerve dysfunction can be facilitated with the mfERG. Our stimulation and analysis techniques allow us to locally differentiate between retinal and optic nerve dysfunction.

Keywords: electroretinography: clinical • neuro-ophthalmology: optic nerve • retina 
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