简易近用对比度视力表的设计和临床应用  

Design and Clinical Application of Simple Near Contrast Visual Acuity Chart

作　　者：闫冉[1] 邓葵兴 陈伟坤[2] 王幼生[2] 

机构地区：[1]广州市中医医院,广东广州510130 [2]广州中医药大学第一附属医院,广东广州510405

出　　处：《临床医学工程》2016年第2期129-130,共2页Clinical Medicine & Engineering

基　　金：广东省教育厅高校科技创新重点项目(项目编号:2012KJCX0034)

摘　　要：目的研制一种简易近用对比度视力表,并评估其在视频终端(VDT)视疲劳诊断中的应用价值。方法以新版国家标准对数近视力表为依据,在视标对比度的设计上,除原来的100%对比度外,增加10%对比度及低亮度两项指标。制作完成后,对35名志愿者以连续操作电脑游戏"连连看"的方法诱导视频终端性视疲劳,随后检测视疲劳者前后近对比度视力的变化,以了解该视力表的临床使用情况。结果游戏前后的高亮度100%对比度近视力差异无统计学意义(P>0.05),而游戏后高亮度10%对比度近视力、低亮度近视力均低于游戏前,差异具有统计学意义(P<0.01)。结论简易近用对比度视力表具有检查方便、敏感性高的特点,可应用于VDT视疲劳的临床诊断。Objective To explore a simple near contrast visual acuity chart, and to evaluate its application value in diagnosis of video display terminal（VDT） asthenopia. Methods According to the new standard of logarithmic near visual chart, we increased 10% contrast ratio and low brightness except primary 100% contrast ratio based on the design of optotype contrast ratio. After completion, 35 volunteers received a computer game（Lianliankan） to induce VDT asthenopia. The changes of near contrast visual acuity of these subjects before and after the game were detected, in order to understand the clinical usage of the vision chart. Results The high brightness 100% contrast near vision before and after the game had no statistical difference（P〉0.05）; but the high brightness 10% contrast near vision and low brightness near vision after the game were significantly lower than those before the game（P〉0.01）. Conclusions The simple near contrast vision chart has the advantages of convenient detection and high sensibility, which can be applied in clinical diagnosis of VDT asthenopia.

关 键 词：视力表 对比度视力 视觉质量 视频终端性视疲劳 

分 类 号：R770.42[医药卫生—眼科]