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Related Experiment Videos

Repeatability of normal multifocal VEP: implications for detecting progression.

Brad Fortune1, Shaban Demirel, Xian Zhang

  • 1Discoveries in Sight, Devers Eye Institute, Legacy Health System, Portland, OR 97232, USA. bfortune@discoveriesinsight.org

Journal of Glaucoma
|April 25, 2006
PubMed
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The multifocal visual evoked potential (mfVEP) showed slightly better repeatability than standard automated perimetry (SAP) over a 1-year interval in normal controls. This indicates mfVEP may detect early glaucomatous progression more effectively.

Area of Science:

  • Ophthalmology
  • Neuroscience
  • Visual Electrophysiology

Background:

  • Standard automated perimetry (SAP) is a common method for detecting glaucomatous visual field defects.
  • Multifocal visual evoked potential (mfVEP) is an alternative electrophysiological test that assesses retinal function.
  • Assessing the repeatability of these tests is crucial for monitoring disease progression.

Purpose of the Study:

  • To compare the repeatability of mfVEP with SAP in normal individuals over a 1-year period.
  • To evaluate the repeatability of false alarm rates for mfVEP using various cluster criteria.

Main Methods:

  • Fifty normal controls (33 female, 17 male; age 26.7-77.9 years) underwent repeat mfVEP and SAP testing.
  • mfVEPs were recorded using a pattern-reversal dartboard stimulus; two 8-minute runs per eye were averaged.

Related Experiment Videos

  • SAP visual fields were obtained within 17.4 days of mfVEP using the SITA-standard algorithm.

    • Main Results:

    • Point-wise limits of agreement (LOA) for mfVEP signal-to-noise ratio (SNR) averaged 2.9 dB, compared to 4.0 dB for SAP.
    • Abnormal clusters were unlikely to repeat on either mfVEP or SAP.
    • mfVEP repeatability was consistent across the visual field, but limited dynamic range in superior locations may affect progression detection.

    Conclusions:

    • mfVEP demonstrated slightly superior repeatability to SAP over a 1-year retest interval in normal controls.
    • mfVEP may offer advantages in detecting early glaucomatous progression.
    • Confirmation of a 3-point cluster abnormality on mfVEP is a strong indicator of a true defect.