ブルーライト

• 読み: ブルーライト
• ローマ字: burū raito
• 漢字の分解: From English 'blue light' → katakana adaptation ブルーライト
• 発音: /bu.ɾuː.ɾa.i.to/

意味

Blue light emitted from digital screens, believed to disrupt sleep and cause eye strain.

ブルーライト became a major health buzzword in Japan as awareness grew about the potential effects of screen-emitted blue light on sleep quality and eye health. The term drove a huge market for ブルーライトカットメガネ (blue light blocking glasses) and screen filters. While scientific consensus on its dangers is mixed, the term remains deeply embedded in everyday health conversations and product marketing in Japan.

例文

1. 寝る前のブルーライトが睡眠の質を下げるらしいよ。
2. ブルーライトカットのメガネ買ったら目の疲れが減った気がする。
3. スマホのブルーライト設定、ナイトモードにしてる？

使い方ガイド

場面: health, daily conversation, product marketing

トーン: health-conscious, cautionary

正しい言い方

• 寝る1時間前からブルーライト避けるようにしてる。 (I try to avoid blue light starting an hour before bed.)
• ブルーライトカットのフィルム貼った？ (Did you put on a blue light filter?)

避ける言い方

• 「ブルーライトで失明する」など過度に恐怖を煽る表現は避ける (Avoid fearmongering like 'blue light will make you go blind' — effects are debated and less severe than often claimed)

よくある間違い

• Overstating the danger of blue light — while it can affect sleep, claims about severe eye damage are not well supported by current science

起源と歴史

From English 'blue light.' Became a major health and lifestyle buzzword in Japan in the mid-2010s, driving a massive market for blue light filtering products.

文化的背景

時代: Mid-2010s onward

世代: All ages

社会的背景: Universal

地域メモ: Used across all of Japan. Japan is one of the largest markets for blue light blocking glasses, with major eyewear chains like JINS and Zoff promoting dedicated blue light cut lines.