McKerral M, Lachapelle P, Benoit J
Department of Ophthalmology, Montreal Children's Hospital, Quebec, Canada.
Doc Ophthalmol. 1992;79(2):177-85. doi: 10.1007/BF00156576.
We investigated the effect of reduced luminance and increased scatter on the pattern visual evoked potential and eye-hand reaction time evoked to a check size of 0.5 degrees in 10 normal subjects. Data analysis indicated that a reduction in luminance as well as an increase in scatter caused a statistically significant increase in the peak time of the pattern visual evoked potential P100 wave. The reaction time, however, was not significantly affected by the initial 0.9-log unit attenuation of the stimulus luminance or the 0.3 scatter filter. Further attenuation of luminance or increase of scatter also yielded statistically significant increases. Our results suggest that the reaction time is less affected by a reduction in luminance or an increase in scatter of a 0.5 degrees stimulus than the pattern visual evoked potential is and therefore represents a more reliable test to assess visual function, especially in the presence of medial opacities, which are known to reduce luminance and produce scatter.
我们研究了在10名正常受试者中，降低亮度和增加散射对0.5度视标诱发的图形视觉诱发电位和眼手反应时间的影响。数据分析表明，亮度降低以及散射增加会导致图形视觉诱发电位P100波的峰值时间在统计学上显著增加。然而，反应时间并未受到刺激亮度最初0.9对数单位衰减或0.3散射滤光片的显著影响。亮度的进一步衰减或散射的增加也在统计学上产生了显著增加。我们的结果表明，与图形视觉诱发电位相比，0.5度刺激的亮度降低或散射增加对反应时间的影响较小，因此反应时间是评估视觉功能更可靠的测试，尤其是在存在已知会降低亮度并产生散射的中度混浊的情况下。
