摘要
目的:用计算机控制检测研究视力时间阈值。方法:用pascal语言程序设计视标。视标的大小、显示程序和持续时间由计算机控制。受试者从距离显示器5m处看视标。采用阶梯法测试不同视力受试者的视力时间阈值。结果:检测到约为毫秒级的视力时间阈值。视力1.0组的视力时间阈值平均约为28.10msec,视力1.2组的视力时间阈值平均约为27.90msec,视力1.5组的视力时间阈值平均约为27.80msec。结论:视力与视力时间阈值不成正比,视力好的个体其视力时间阈值不一定短。
Objective： To detect time threshold of visual acuity. Methods： The optotypes are programmed in pascal. The size, the program and the lasting time of the optotypes are controlled by a computer. The subject looked at an optotype on the distant of 5 m. The time threshold of visual acuity is detected with the staircase method. Results： Time threshold of visual acuity in normal young men whose visual acuity are 1.0 is about 28.10msec, that in normal young men whose visual acuity are 1.2 is about 27.90msec, and that in normal young men whose visual acuity are 1.5 is about 27.80msec. Conclusions： From the research results above, we can draw a conclusion that the time threshold of visual acuity is not only related with the visual acuity.
出处
《现代生物医学进展》
CAS
2009年第7期1279-1281,共3页
Progress in Modern Biomedicine
基金
湖南省教育厅科研资助项目(No.04C423)
关键词
视力时间阈值
阶梯法
计算机控制
Time threshold of visual acuity
Visual acuity
Staircase method
Controlled by a computer
