【摘要】 目的:探讨正常人对比敏感度(contrast sensitivity,CS)的特征,以获得正常参考值。方法:应用法国Metrovision公司生产的Vision Monitor视觉诱发系统检查正常人40例(80眼)最佳矫正视力后暗视和明视下空间频率0.8,1.5,3,6,12,20cpd的对比敏感度,按年龄不同分成2组:A组(16～49岁)56眼、B组(50～65岁)24眼,对2组暗视和明视下各空间频率的对比敏感度结果进行比较。结果:正常人对比敏感度函数图形呈倒U形,在中频区(3cpd和6cpd)最高。随年龄的增长,暗视和明视下各空间频率的对比敏感度均逐渐下降;50岁以上年龄组对比敏感度较50岁以下年龄组显著下降(P<0.05)。50岁以下正常人暗视下较明视下在空间频率12,20cpd对比敏感度降低,差异有显著性(P<0.05)。结论:我们的研究基本上准确、客观的反映了正常人CS的特征,为临床研究提供了较可靠的正常值。更多还原

【Abstract】 · AIM:To test the character isticsof contrast sensitivity(CS)in normal human subjects so as to obtain reference values.· METHODS:By using Vision Monitor visual evoked response imaging system,the contrast sensitivity was recorded in 40 normal subjects(80 eyes)under bright and dark environment.The subjects were divided into three groups by age:56 eyes in group A(16-49 years old)and 24 eyes in group B(50-65 years old).· RESULTS:The contrast sensitivity function in normal subjects liked an upside down U-shaped graph.With age increased,there was a gradual decline in the CS of all spatial frequencies.All spatial frequencies under bright environment and dark environment were lower in Group B than in Group A,with statistically significant difference(P <0.05).· CONCLUSION:The spatial characteristics of contrast sensitivity in normal subjects are detected,which may provide reliable normal reference values for clinical studies.·更多还原