Prolongation of implicit time of multifocal electroretinogram in retinal circulatory disorders Kouji Aoyagi 1 , Yasutaka Kimura 1 , Hiroaki Isono 1 , Hideo Akiyama 1 , Takahiro Sugawara 1 1Dept of Ophthalmol, Gunma Univ Sch of Med pp.65-70
Published Date 1998/1/15
DOI https://doi.org/10.11477/mf.1410905700
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We examined 12 eyes of proliferative diabetic retinopathy and 5 eyes of branch retinal artery occlusion by multifocal electroretinography. We used a visual evoked response imaging system, VERIS III. In diabetic retinopathy, the response density was decreased by 79%, amplitude was decreased by 44% and implicit time was prolonged by 23% as compared with normal controls. In branch retinal artery occlusion, the affected quadrant showed reduced response density by 48%, reduced amplitude by 12% and prolonged implicit time by 13% as compared with unaffected quandrants. The findings show that the response density is influenced by the reduced amplitude and largely by prolonged implicit time. This feature was caused as the current system uses the scalar product method based on the templates in normal eyes to calculate the response density.

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