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KMID : 0360220100510040532
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Journal of the Korean Ophthalmological Society
2010 Volume.51 No. 4 p.532 ~ p.541
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Multifocal Visual Evoked Potential in Normal Subjects
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Kim Hoon-Dong
Park Sang-Hyouk
Ohn Young-Hoon
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Abstract
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Purpose: To introduce the clinical utility of multifocal visual evoked potential (mfVEP) and to assess the waveform from normal Korean subjects.
Methods: mfVEP with 4 channel recording was performed using the RETIscanⓡ system (Roland Consult, Wiesbaden, Germany) for 25 eyes of 25 normal subjects. Amplitudes and implicit times were obtained from ring-shaped 6 areas and 4 sectors. To investigate the false-positive ratio of the examination, stimuli were given with one-half of the CRT monitor completely covered and the results were compared.
Results: Amplitudes of P1, N2 were larger in the central 10°area than other areas (p＜0.001). Amplitudes were reduced and implicit times were prolonged on peripheral areas. P1 amplitudes were larger in the inferior field. Waves with large amplitudes by noise were recorded in 13.7% of covered areas.
Conclusions: mfVEP is useful tool to detect local optic nerve damage and rule out the non-organic cause of visual field defect. However, mfVEP results are difficult to interpret due to noise and poor patient cooperation. Standardization of mfVEP is necessary for its application.
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KEYWORD
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Amplitude, Area, Multifocal visual evoked potential, Implicit time, Sector
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