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ISCEV standard for clinical visual evoked potentials (2009 update).

J Vernon Odom1, Michael Bach, Mitchell Brigell

  • 1West Virginia University Eye Institute, Morgantown, WV 26506-9193, USA. jodom@wvu.edu

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Summary

This updated standard refines visual evoked potential (VEP) testing parameters for more consistent diagnostic results. Precise VEP protocols aid in evaluating the visual system's functional integrity.

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Clinical Electrophysiology

Background:

  • Visual evoked potentials (VEPs) are crucial for assessing visual system function.
  • Previous International Society for Clinical Electrophysiology of Vision (ISCEV) standards require updating for improved consistency.
  • Clinical electrophysiology laboratories need standardized protocols for reliable VEP testing.

Purpose of the Study:

  • To update the ISCEV standard for clinical VEP testing.
  • To enhance the precision of VEP test parameters for better inter- and intra-laboratory consistency.
  • To provide standardized VEP protocols for assessing prechiasmal visual pathway function.

Main Methods:

  • Revision of the 2004 ISCEV standard for clinical VEP testing.
  • Definition of precise test parameters for VEP elicitation.
  • Specification of core protocols using pattern-reversal, pattern onset/offset, and flash stimuli.
  • Recommendation of a single recording channel with a midline occipital electrode for prechiasmal assessment.

Main Results:

  • The revised standard introduces more precise test parameters for VEPs.
  • Standardized protocols include specific checkerboard sizes for pattern-reversal and onset/offset VEPs (1° and 0.25° checks).
  • Flash VEP protocols specify luminance increment stimuli subtending at least 20 degrees.

Conclusions:

  • The updated ISCEV standard provides more precise and consistent VEP testing protocols.
  • These standardized protocols facilitate reliable assessment of the visual system's functional integrity.
  • The defined core protocols are designed for global adoption in clinical electrophysiology labs.