| Reduction of Blue Light Emission in Internet-protocol Television and Its Effect on Ocular Fatigue. |
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Hyuna Kim, Hyun Tai Kim, Dae Hwan Shin, Hyun Taek Lim, Chul Young Choi, Woon Jung Cho, Jae Yong Kim, Chan Yun Kim, Hungwon Tchah |
1Department of Ophthalmology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea. htlim@amc.seoul.kr
2Department of Ophthalmology, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea.
3Institute of Cognitive Science, Yonsei University, Seoul, Korea.
4The Institute of Vision Research, Department of Ophthalmology, Yonsei University College of Medicine, Seoul, Korea. |
| 청색광 배출도를 조절한 인터넷 텔레비전 영상의 눈피로도 감소효과 |
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김현아1⋅김현태1⋅신대환2⋅임현택1⋅최철영2⋅조운정3⋅김재용1⋅김찬윤4⋅차흥원1 |
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울산대학교 의과대학 서울아산병원 안과학교실1, 성균관대학교 의과대학 강북삼성병원 안과학교실2, 연세대학교 인지과학연구소3, 연세대학교 의과대학 안과학교실 시기능개발연구소4 |
Correspondence:
Hyun Taek Lim,
Email: htlim@amc.seoul.kr
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Received: 23 November 2017 • Revised: 13 December 2017 • Accepted: 19 February 2018 |
| Abstract |
PURPOSE
The blue light emitted from electronic devices may be harmful to the eye. We investigated whether internet-protocol television (TV) with lowered blue light emission reduced ocular fatigue. METHODS: A total of 98 healthy subjects were recruited. They watched an animated movie (A) and an identical version except for reduced blue light (B), sequentially for 1 hour in random order. Before and after watching the movies, we measured the distance and near refraction and tear break-up time objectively. Ocular discomfort score and the earliest onset time of the ocular fatigue symptoms were also measured using our specially designed subjective ocular discomfort scale. RESULTS: The median age of the participants was 28.5 years, and there were 56 females out of 98 total participants. Both distance and near refraction were not significantly different before versus after watching the movies, nor between viewing movies A and B. However, the accommodative amplitude measured by subtracting the near refraction from the distance refraction was found to be greater after watching movie B compared with movie A in a subset of subjects with hyperopia [1.92 vs. 1.72 diopters (D) for the right eye and 2.14 vs. 1.83 D for the left eye; p = 0.04 and p < 0.01, respectively]. The ocular discomfort score was lower (15.40 vs. 12.85; p = 0.10), but not significantly, and the earliest ocular fatigue onset time was significantly delayed (23.48 vs. 34.51 minutes; p < 0.01), after watching movie B. CONCLUSIONS: Reduction of blue light emission alleviated ocular fatigue caused by TV displays. Watching TV with lower blue light may provide benefits to hyperopic individuals by reducing eye strain and improving the accommodative amplitude. |
| Key Words:
Digital eye strain;Internet-protocol television;Ocular discomfort score;Ocular fatigue |
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