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背景光强度与视网膜电图振荡电位

Background light intensity and the oscillatory potentials of the electroretinogram
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摘要 目的:定量分析不同强度背景光照明下,视网膜电图(electroretinogram,ERG)振荡电位(oscillatory potentials,OPs)各子波的变化,探讨背景光照明对振荡电位子波的影响.方法:记录出生25~29天Albino鼠暗视及四个不同强度背景光("弱"、"次弱"、"次强"、"强")照明下全视野ERG a波,b波和振荡电位.刺激闪光和背景照明光源均为白炽灯.刺激闪光强度1.43×102cd/m2,闪光时程75ms,闪光间隔时间1分钟;背景照明光强度1.43×10-6~1.43×100cd/m2,以二个对数单位分级.结果:振荡电位各子波在不同强度背景光照明下反应不同,"弱"背景光照明下,O1和O2振幅增高;O1振幅在"次弱"背景光照明时增高更明显;在"次强"背景光照明下,O1和O2消失,O3、O4和O5,均显著增高;当采用"强"背景光照明时,所记录的O3和O4振幅显著下降,O5振幅无变化.同时记录的ERG a波和b波在"次强"和"强"背景光照明下振幅显著降低.除O2峰时在"次弱"照明时显著延长外,其余子波在二个弱背景光照明下峰时无变化;但在二个强背景光照明下,O3、O4和O5峰时均明显缩短.结论:Albino鼠眼振荡电位各子波在不同强度背景光照明下的不同反应提示它们在视网膜的起源不同.弱背景光照明下短峰时子波活跃而强背景光照明时长峰时子波活跃,提示短峰时子波可能与暗视系统相关而长峰时子波则与明视系统相关.
出处 《中国眼耳鼻喉科杂志》 2001年第6期143-146,158,共5页 Chinese Journal of Ophthalmology and Otorhinolaryngology
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