Department of Ophthalmology, College of Medicine, Chung-Ang University Hospital, #224-1, Heukseok-Dong, Dongjak-Gu, Seoul 156-755, Republic of Korea.
BMC Ophthalmol. 2014 Mar 11;14:29. doi: 10.1186/1471-2415-14-29.
To validate the association between accommodation and visual asthenopia by measuring objective accommodative amplitude with the Optical Quality Analysis System (OQAS®, Visiometrics, Terrassa, Spain), and to investigate associations among accommodation, ocular surface instability, and visual asthenopia while viewing 3D displays.
Fifteen normal adults without any ocular disease or surgical history watched the same 3D and 2D displays for 30 minutes. Accommodative ability, ocular protection index (OPI), and total ocular symptom scores were evaluated before and after viewing the 3D and 2D displays. Accommodative ability was evaluated by the near point of accommodation (NPA) and OQAS to ensure reliability. The OPI was calculated by dividing the tear breakup time (TBUT) by the interblink interval (IBI). The changes in accommodative ability, OPI, and total ocular symptom scores after viewing 3D and 2D displays were evaluated.
Accommodative ability evaluated by NPA and OQAS, OPI, and total ocular symptom scores changed significantly after 3D viewing (p = 0.005, 0.003, 0.006, and 0.003, respectively), but yielded no difference after 2D viewing. The objective measurement by OQAS verified the decrease of accommodative ability while viewing 3D displays. The change of NPA, OPI, and total ocular symptom scores after 3D viewing had a significant correlation (p < 0.05), implying direct associations among these factors.
The decrease of accommodative ability after 3D viewing was validated by both subjective and objective methods in our study. Further, the deterioration of accommodative ability and ocular surface stability may be causative factors of visual asthenopia in individuals viewing 3D displays.
通过使用光学质量分析系统（OQAS®，Visiometrics，Terrassa，西班牙）测量客观调节幅度，验证调节与视觉疲劳之间的关系，并研究在观看 3D 显示器时调节、眼表面不稳定和视觉疲劳之间的关系。
15 名没有任何眼部疾病或手术史的正常成年人观看相同的 3D 和 2D 显示器 30 分钟。在观看 3D 和 2D 显示器前后评估调节能力、眼保护指数（OPI）和总眼部症状评分。通过近点调节（NPA）和 OQAS 评估调节能力以确保可靠性。OPI 通过将泪膜破裂时间（TBUT）除以眨眼间隔（IBI）来计算。评估观看 3D 和 2D 显示器后调节能力、OPI 和总眼部症状评分的变化。
通过 NPA 和 OQAS 评估的调节能力、OPI 和总眼部症状评分在观看 3D 后显著改变（p = 0.005、0.003、0.006 和 0.003），但观看 2D 后没有差异。OQAS 的客观测量验证了观看 3D 显示器时调节能力的下降。观看 3D 后 NPA、OPI 和总眼部症状评分的变化之间存在显著相关性（p < 0.05），表明这些因素之间存在直接关联。
本研究通过主观和客观方法验证了观看 3D 后调节能力的下降。此外，调节能力和眼表面稳定性的恶化可能是观看 3D 显示器的个体出现视觉疲劳的原因。
