Influence of cataract on the multifocal ERG recording a pre- and postoperative comparison

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• 作者：Ursula V. Wrdehoff ; Anja M. Palmowski ; Bernhild Heinemann-Vernaleken ; Reiner Allgayer and Klaus W. Ruprecht
• 关键词：cataract ; electroretinography ; multifocal ERG
• 刊名：Documenta Ophthalmologica
• 出版年：2004
• 出版时间：January, 2004
• 年：2004
• 卷：108
• 期：1
• 页码：67-76
• 全文大小：267.1 KB
• 刊物类别：Medicine
• 刊物主题：Medicine & Public Health
  Ophthalmology
  
• 出版者：Springer Netherlands
• ISSN：1573-2622

文摘

To study the influence of cataract on the multifocal electroretinogram (mfERG), 18 patients underwent mfERG recordings prior to and following cataract surgery. The central 50° of the retina were stimulated by 103 hexagons alternating independently between white and black according to a binary m-sequence. The frame rate was 75Hz. The maximum luminance was 200cd/m2, the minimum luminance cd/m2 with a mean luminance of 100cd/m2. For each retinal location, the latencies of the first negative peak (N1), the first positive peak (P1) and the second negative peak (N2) as well as the amplitude from N1 to P1 and the amplitude from P1 to N2 of the first order response were obtained. Concentric ring averages around the foveal response were analyzed. Following cataract surgery, the mean amplitude of the response in the central four degrees increased from 37.83 to 42.37 for N1P1 (p = 0.019) and from 39.44 to 47.20 for P1N2 (p = 0.001). To reduce the influence of retest variability, each response average was divided by the recording''s overall amplitude. For the central 4 degrees this ratio increased by 0.18 (p = 0.002) for N1P1 and by 0.27 (p