Lin Chao-Wen, Yeh Feng-Ming, Wu Bo-Wen, Yang Chang-Hao
Department of Ophthalmology, National Taiwan University Hospital, Taipei, Taiwan.
Department of Optometry, Yuanpei University of Medical Technology, Hsinchu, Taiwan.
Clin Exp Optom. 2019 Sep;102(5):513-520. doi: 10.1111/cxo.12878. Epub 2019 Feb 25.
Computer vision syndrome is common and affects performance of visual tasks. Background illumination, light source, light compensation, position of the display, contrast and glare are environmental factors associated with computer vision syndrome. The aim of this study is to investigate the effects of reflected glare and visual field lighting on computer vision syndrome.
In a reflected glare experiment, participants performed a two-hour visual task using a glossy, matte, or glare-free surface display in two visual environments (normal, glare). In a visual field lighting experiment, participants performed the visual task in dim lighting, uneven supplementary lighting, or uniform supplementary lighting. Visual function parameters, including critical fusion frequency, heterophoria, amplitude of accommodation and accommodative facility were evaluated by the investigators and a visual fatigue questionnaire was completed before and after the visual task. Visual performance was also recorded. In addition, the variation of pupil size under different lighting conditions was analysed.
Critical fusion frequency was the only visual function parameter which decreased significantly after the visual task. The questionnaire score was significantly higher in a glare environment and was lower when the task was performed using a glare-free display. Visual performance was significantly worse in the glossy display group. The increment in the questionnaire score was smaller in the uniform supplementary lighting group. Visual performance was significantly worse in the dim lighting or uneven supplementary lighting group, but not in the uniform supplementary lighting group. Variation in pupil size was significantly greater in the dim lighting condition than in the supplementary lighting condition.
Critical fusion frequency is an effective indicator of computer vision syndrome. Glare-free displays could alleviate visual fatigue and preserve visual performance. Uniform supplementary lighting could decrease variation in pupil size and prevent eye strain.
计算机视觉综合征很常见，会影响视觉任务的表现。背景照明、光源、光补偿、显示器位置、对比度和眩光都是与计算机视觉综合征相关的环境因素。本研究的目的是调查反射眩光和视野照明对计算机视觉综合征的影响。
在反射眩光实验中，参与者在两种视觉环境（正常、眩光）下使用有光泽、哑光或无眩光表面的显示器进行两小时的视觉任务。在视野照明实验中，参与者在昏暗照明、不均匀辅助照明或均匀辅助照明下进行视觉任务。研究人员评估了包括临界融合频率、隐斜视、调节幅度和调节灵活度在内的视觉功能参数，并在视觉任务前后完成了一份视觉疲劳问卷。还记录了视觉表现。此外，分析了不同照明条件下瞳孔大小的变化。
临界融合频率是视觉任务后唯一显著下降的视觉功能参数。眩光环境下问卷得分显著更高，使用无眩光显示器执行任务时得分更低。有光泽显示器组的视觉表现明显更差。均匀辅助照明组问卷得分的增量更小。昏暗照明或不均匀辅助照明组的视觉表现明显更差，但均匀辅助照明组则不然。昏暗照明条件下瞳孔大小的变化明显大于辅助照明条件。
临界融合频率是计算机视觉综合征的有效指标。无眩光显示器可减轻视觉疲劳并保持视觉表现。均匀辅助照明可减少瞳孔大小的变化并预防眼睛疲劳。
