Multifocal Visual Evoked Potential in Normal Subjects.

Kim, Hoon Dong; Park, Sang Hyouk; Ohn, Young Hoon

doi:2010.51.4.532

J Korean Ophthalmol Soc > Volume 51(4); 2010 > Article

Original Article

Journal of the Korean Ophthalmological Society 2010;51(4):532-541.
DOI: https://doi.org/10.3341/jkos.2010.51.4.532 Published online April 15, 2010.

Multifocal Visual Evoked Potential in Normal Subjects.

Hoon Dong Kim, Sang Hyouk Park, Young Hoon Ohn

¹Department of Ophthalmology, Soonchunhyang University College of Medicine, Bucheon, Korea. yhohn@schbc.ac.kr
²Department of Ophthalmology, Soonchunhyang University College of Medicine, Gumi, Korea.

정상안에서의 다국소시유발전위

김훈동¹ㆍ박상혁²ㆍ온영훈¹

Department of Ophthalmology, Soonchunhyang University College of Medicine¹, Bucheon, Korea, Department of Ophthalmology, Soonchunhyang University College of Medicine,² Gumi, Korea

Abstract

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(R) 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 10degrees 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.

Key Words: Amplitude;Area;Multifocal visual evoked potential;Implicit time;Sector