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Assessment of visual disability using visual evoked potentials.

Jihoon Jeon1, Seiyul Oh, Sungeun Kyung

  • 1Department of Ophthalmology, Dankook University Hospital, 359 Manghang-Ro, Dongnam-Gu, Cheonan-City, Chungchungnam-Do, South Korea.

BMC Ophthalmology
|August 8, 2012
PubMed
Summary
This summary is machine-generated.

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Visual evoked potential (VEP) objectively quantifies visual acuity in normal and amblyopic patients. This method aids in disability assessment by distinguishing malingering from genuine visual pathway lesions using amplitude values.

Area of Science:

  • Ophthalmology
  • Neuroscience
  • Medical Diagnostics

Background:

  • Visual acuity is crucial for diagnosing visual pathway lesions and assessing disability.
  • Objective quantification methods are needed to supplement subjective visual acuity measurements.
  • Pattern Visual Evoked Potential (PVEP) is a potential tool for objective visual acuity assessment.

Purpose of the Study:

  • To validate the use of PVEP for objective visual acuity quantification in normal and amblyopic patients.
  • To determine PVEP's utility in predicting visual acuity for disability assessment in cases of visual pathway lesions.
  • To establish objective criteria for differentiating malingering from real visual disability.

Main Methods:

  • Retrospective chart review of patients with normal vision, amblyopia, optic neuritis, and visual disability.

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  • Analysis of PVEP amplitude and latencies correlated with visual acuity (logMAR) in 38 normal and amblyopic subjects.
  • Calculation of objective visual acuity using PVEP amplitude in patients with optic neuritis and visual disability.

    • Main Results:

    • Significant linear regression found between PVEP amplitude and visual acuity (logMAR) in normal and amblyopic subjects (y = -0.072x + 1.22).
    • PVEP successfully predicted visual acuity in optic neuritis patients, showing relationships between amplitude and acuity.
    • A PVEP amplitude cutoff of >5.77 μV was identified to differentiate malingering from real visual disability.

    Conclusions:

    • PVEP amplitude provides a reliable objective measure for confirming subjective visual acuity.
    • The established cutoff value of >5.77 μV using PVEP is effective for disability evaluations.
    • PVEP is a valuable tool for distinguishing malingering from genuine visual impairment, particularly in trauma cases without obvious disc pallor.