疫学研究 (observational study)

[思春期層でのスマートホンばく露と眼の健康との関連] epidem.

Association between Exposure to Smartphones and Ocular Health in Adolescents

著者: Hwang Y, Kang S, Kim M, Kim TS, Seo J, Ahn H, Yoon S, Yun JP, Lee YL, Ham H, Yu HG, Park SK

掲載誌: Ophthalmic Epidemiol 2016; 23 (4): 269-276

この研究は、従来の携帯電話に比べて画面の凝視時間が長いと思われるスマートホンの眼への影響を検討するために、韓国の3都市の思春期層（n=715）を対象にスマートホン使用状況および眼症状（ぼやけ、赤み、視覚障害、分泌、炎症、流涙、ドライアイ）の自己申告スコアについて構造化質問票調査した。その結果、スマートホンへの高度ばく露群で眼症状有病率の有意な上昇が見られた；長時間使用群は数多くの眼症状を持つ傾向と有意に関連した；短時間使用群（一日の使用時間≤2時間）と比較した過剰／断続的使用群（一日の使用時間>2時間、かつ連続使用時間≤2時間）および過剰／持続的使用群（一日の使用時間>2時間、かつ連続使用時間>2時間）の複数眼症状のオッズ比はそれぞれ、OR= 2.18（95% CI 1.09-4.39）、OR=2.26（同1.11-4.57）であった、などを報告している。

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研究の目的(著者による)

A cross-sectional study was conducted in Korea to investigate the association between smartphone use and ocular symptoms in adolescents.

影響評価項目／リスク推定のタイプ

eye symptoms: vision blurring, redness, visual disturbance, secretion, inflammation, lacrimation and dryness

リスク推定のタイプ:

有病率

(オッズ比(OR))

ばく露

- 移動体通信システム
- 携帯電話

ばく露評価

質問票: ownership of a smartphone, duration of ownership, average number of hours of use per day, number of hours of continuously use without stopping per day
計算: cumulative lifetime use (lifetime hours) was calculated by multiplying the daily use duration with years of use

ばく露集団

グループ	説明
参照集団 1	daily smartphone use: < 2 hours/day (short)
集団 2	daily smartphone use: > 2 hours/day (intermediate)
集団 3	daily smartphone use: > 2 hours/day and continuous use ≤.2 hours/occasion (excessive/intermittent)
集団 4	daily smartphone use: > 2 hours/day and continuous use > 2 hours/occasion (excessive/persistent)
参照集団 5	lifetime smartphone use: ≤ 3 lifetime hours (low)
集団 6	lifetime smartphone use: 4 - 8 lifetime hours (intermediate)
集団 7	lifetime smartphone use: 9 - 12 lifetime hours (high)
集団 8	lifetime smartphone use: > 12 lifetime hours (extreme)

調査対象集団

グループ:
- 男性
- 女性
- 小児
年齢: 14–18年
観察期間: 2013
調査地域: Korea (Seoul, Busan and Siheung)

調査規模

タイプ	値
合計	734
評価可能	715

統計学的分析方法:

ロジスティック回帰

(調整:

年齢
性別
住宅地域
daily sleep duration, use of contact lenses, computer use

)

結論(著者による)

Higher prevalence rates for ocular symptoms were observed in adolescents with greater exposure to smartphones. Longer daily smartphone use was associated with a higher likelihood of having multiple ocular symptoms (5-7 symptoms out of 7 symptoms). Excessive/intermittent use (group 3) and excessive/persistent use (group 4) compared to shorter use (group 1) were associated with multiple ocular symptoms (OR 2.18, CI 1.09-4.39; OR 2.26, CI 1.11-4.57, respectively). A higher lifetime exposure to smartphones (group 8) was associated with a higher likelihood of having multiple ocular symptoms (OR 3.05, CI 1.51-6.19).
The authors conclude that longer exposure to smartphones can have a negative impact on ocular health in adolescents.

研究助成

Seoul National University Hospital, Korea