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为确定玻璃体切割术前ＥＲＧ检查对术后视力预测的数量评价，为临床医生提供准确的判断标准，对由各种原因引起的玻璃体混浊７２眼，玻璃体切割术前作双眼ＥＲＧ检查，以术后较长时间的随访视力作为标准，术后视力大于或等于０．０５，小于０．０５两组眼的ｂ波振幅均数作为临界点，如ｂ波振幅大于３１６．６６５μｖ（临界值），９２．３％的眼获得０．０５以上的术后视力（阳性预测值）；术后视力０．０５以上（包括０．０５）的眼中，５４．５０％的眼ｂ波振幅大于３１６．６６５μｖ（敏感度）；同样地，ａ波的阳性预测值、敏感度分别为８１．２５％、５９．１％。ｂ波振幅小于３１６．６６５μｖ的眼中５６．５％的术后视力低于０．０５（阴性预测值），术后视力低于０．０５的眼中９２．９％的眼术前ｂ波振幅低于３１６．６６５μｖ（特异度）；ａ波的阴性预测值、特异度分别为５５％、７８．６％。在评价视网膜电图方面作者利用正常人ｂ与ａ波间的函数关系来评价视网膜整体功能，可克服不同病人间因玻璃体混浊情况不同，不同实验室间因刺激条件不一致所引起的相互间不能比较。所得结果与ｂ波一致，但这种方法是以ＥＲＧ各成份的起源为基础，结果较准确。结果：显示ｂ波预测术后视力较ａ波好，并?
In order to determine the amount of postoperative visual acuity (ERG) assessment before the vitrectomy, the clinician was provided with accurate criteria for evaluating the vitreous opacity caused by various causes in 72 eyes. Both eyes were examined with ERG before vitrectomy. Long-term follow-up visual acuity as the standard, postoperative visual acuity greater than or equal to 0.05, less than 0.05 two groups of eye b wave amplitude as a critical point, such as b-wave amplitude greater than 316.665μv (critical value), 92 .3% of the eyes obtained postoperative visual acuity of 0.05 or more (positive predictive value); postoperative visual acuity of 0.05 or more (including 0.05) of eyes, 54.50% of eyes b wave amplitude greater than 316.665μv Sensitivity); similarly, the positive predictive value of a wave, the sensitivity was 81.25%, 59.1%. 56.5% of postoperative visual acuities in the b wave amplitudes less than 316.665 μv were below 0.05 (negative predictive value), 92.9% of eyes with postoperative visual acuity of less than 0.05 had low amplitude of preoperative b wave At 316.665μv (specificity); negative predictive value of a wave, the specificity was 55%, 78.6%. In the evaluation of electroretinogram, the author uses the normal relations between b and a wave to evaluate the integral function of the retina, which can overcome the different vitreous opacities among different patients and the incompatibility between different laboratories due to the stimulus conditions can not be compared with each other . The results are consistent with the b wave, but this method is based on the origin of the ERG ingredients, the result is more accurate. Results: Show b-wave visual acuity better than a wave, and?