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Blog 2026/07/24 19:57 by SHU3

The real cause of eye strain is the difference in brightness between the screen and its surroundings, rather than blue light itself

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Do you think your eyes will feel better if you wear blue light cut glasses? Actually, this seems to be a bit different scientifically. Both the American Academy of Ophthalmology and the Japan Ophthalmological Society state that there is no evidence that blue light from everyday displays is harmful to the eyes. The image of "blue light = bad" is actually largely based on misconception. When there is a large difference in brightness between the display screen and the surrounding environment, the pupils adjust their size according to the brightness, which increases the strain on the eyes. You can reduce eye fatigue by keeping the screen brightness at about the same level as the surrounding brightness. The ideal screen brightness is set to about 3 times the brightness of the surrounding lighting. If you look at a screen that is too bright in a dark environment, your pupils will contract excessively, increasing eye fatigue. 3 Screen Setting Adjustments You Can Make Today ① Adjust screen brightness to match your surroundings Check your office lighting or room brightness and make sure the screen is not too glaring. ② Take advantage of night mode and dark mode Many devices are equipped with features like iPhone's "Night Shift" or Windows' "Night Light" that automatically adjust the screen's color temperature according to the time of day. It is recommended to switch to warm color display at night. ③ Be aware of the distance from the screen Since the amount of blue light you are exposed to decreases the farther you are from the source, keep your PC 40-50cm away and your smartphone 30cm or more away. Summary Before relying on glasses or countermeasure products, simply reviewing the brightness and distance of your screen can be effective. You don't need to buy special equipment; you can start today by just changing your settings. https://www.cnn.co.jp/fringe/35207965.html External link
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目の疲れの本当の原因は、ブルーライトそのものより画面と周囲の明るさの差

ブルーライトカットメガネをかければ目は楽になる…そう思っていませんか?実はこれ、科学的には少し違うようです。 米国眼科学会も日本眼科学会も、日常的なディスプレイのブルーライトが目に有害だという証拠はないとしています。「ブルーライト=悪者」というイメージは、実は思い込みの部分が大きいのです。 ディスプレイ画面と周囲の明るさに差が大きいと、瞳孔が明るさに応じて大きさを調整するため、目への負担が大きくなります。画面の輝度を周囲の明るさと同程度に抑えることで、目の疲れを軽減できます。 画面の明度は、周囲の照明の約3倍程度に設定するのが理想とされています。暗い環境で明るすぎる画面を見ると、瞳孔が過度に収縮し、目の疲労が増してしまいます。 今日からできる画面設定の見直し3つ ① 画面の明るさを周囲に合わせる オフィスの照明や部屋の明るさに合わせて、画面がまぶしすぎないか確認しましょう。 ② 夜間モード・ダークモードを活用 iPhoneの「Night Shift」やWindowsの「夜間照明」など、時間帯に応じて画面の色温度を自動調整する機能が多くの端末に搭載されています。夜は暖色系表示に切り替えるのがおすすめです。 ③ 画面との距離を意識する ブルーライトは発生源から離れるほど浴びる量が減るため、PCは40〜50cm、スマホは30cm以上離して見るようにしましょう。 まとめ メガネや対策グッズに頼る前に、まず画面の明るさと距離を見直すだけでも効果があります。専用機材を買わなくても、今日から設定を変えるだけで始められますよ。 https://www.cnn.co.jp/fringe/35207965.html External link
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