论文部分内容阅读
目的测定不同背景光强度下的局部视网膜电图的振幅及黄斑／视盘振幅比，研究它们的变化，评价背景光强度在局部视网膜电图中的作用。方法对１８例（２０眼）正常人进行不同背景光强度下的局部视网膜电图的测定，背景光强度依次为２５，５０，１００，１５０，２５０，６００ｃｄ／ｍ２．分别记录刺激黄斑及视盘的反应。将波形进行Ｆｏｕｒｉｅｒ分析，测量刺激频率的基波振幅，计算黄斑／视盘振幅比。结果在２５，５０ｃｄ／ｍ２的背景光下，局部视网膜电图的基波振幅最大（ｘ＝１．６６±０．８５９），黄斑／视盘振幅比最小（ｒ＝１．４６９）。在１００ｃｄ／ｍ２的背景光强度下，局部视网膜电图的基波振幅较大（ｘ＝１．１８５±０．１８１），而黄斑／视盘振幅比达到最大（ｒ＝３．９５）。当背景光继续增加时（２５０，６００ｃｄ／ｍ２），局部视网膜电图的基波振幅最小（ｘ＝０．４１６±０．１４６），黄斑／视盘振幅比则较小（ｒ＝２．２７）。结论背景光较弱时，记录的电反应包含了刺激光斑在眼内弥散后刺激视网膜其它部位而产生的电活动，反应振幅大，但黄斑／视盘的振幅比小，局部视网膜电图的精确性差；背景光过强时。视网膜遭到漂白，视网膜敏感度降低，记录的电反应振幅小，黄斑／视盘?
Objective To determine the amplitude of local electroretinogram (ERG) and macular / optic disc amplitude ratio under different background light intensities and study their changes to evaluate the effect of background light intensity in local electroretinography. Methods 18 cases (20 eyes) of normal people under different background light intensity of the local electroretinogram was measured, the background light intensity were 25,50,100,150,250,600 cd / m2. Respectively recorded stimulation of macular and optic disc response. Fourier analysis of the waveform, measuring the amplitude of the fundamental frequency of the stimulation frequency, calculate the macular / optic disc amplitude ratio. Results Under the background light of 50 and 50cd / m2, the amplitude of the fundamental wave of local electroretinogram was the highest (x = 1.66 ± 0.859) and the amplitude of macular / optic disc was the smallest (r = 1.469). At 100 cd / m2 of background light intensity, the amplitude of the fundamental wave of the local electroretinography was larger (x = 1.185 ± 0.181), while the macular / optic disc amplitude ratio reached the maximum (r = 3.95). When the background light continued to increase (250,600 cd / m2), the amplitude of the fundamental wave of the local electroretinogram was the smallest (x = 0.416 ± 0.146) and the amplitude of the macular / optic disc was smaller (r = 2.27) . Conclusions In the case of weak background light, the recorded electrical responses include electrical stimulation of the stimulated spot to stimulate other parts of the retina after intraocular dissection. The amplitude of the response is large but the amplitude of the macula / optic disc is small and the accuracy of the local electroretinography is poor When the backlight is too strong. The retina was bleached, the sensitivity of the retina was reduced, and the amplitude of the recorded electrical response was small. The macular / optic disc?