Wiggins N P, Daum K M
School of Optometry/The Medical Center, University of Alabama, Birmingham 35294.
J Am Optom Assoc. 1991 Sep;62(9):680-4.
The purpose of this study was to evaluate the effects of small amounts of uncorrected astigmatism on the visual comfort of video display terminal (VDT) users. We hypothesized that these small errors produce visual discomfort in the use of these devices even though visual acuity is relatively unaffected. Eight subjects (ages 23-35 years) with corrected visual acuities of 20/20 participated. Our double-masked cross-over experiment included two 25-minute periods during which the subject read from a VDT. The subjects were randomly assigned to wear either the test lens pair (+0.50 D x 090) or a control lens pair (+0.12 DS) over their best correction during the first period and the alternative pair during the second period. A questionnaire was used to obtain ratings of visual discomfort. Our analysis of the data indicated greater reported eyestrain for the test lens pair (Wilcoxon signed-rank test, p = 0.01). These results suggest careful consideration be given to the correction of small amounts of astigmatic errors for VDT users.
本研究的目的是评估少量未矫正散光对视频显示终端（VDT）用户视觉舒适度的影响。我们假设，即使视力相对未受影响，这些小误差在使用这些设备时也会产生视觉不适。八名矫正视力为20/20的受试者（年龄在23至35岁之间）参与了研究。我们的双盲交叉实验包括两个25分钟的时间段，在此期间受试者从VDT上阅读内容。在第一个时间段，受试者被随机分配佩戴测试镜片组（+0.50 D×090）或对照镜片组（+0.12 DS），并在最佳矫正基础上佩戴，第二个时间段则佩戴另一组镜片。使用问卷来获取视觉不适的评分。我们对数据的分析表明，测试镜片组报告的眼疲劳程度更高（Wilcoxon符号秩检验，p = 0.01）。这些结果表明，对于VDT用户，应仔细考虑矫正少量散光误差。
