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While dark mode apps reduce screen brightness, making them gentler on the eyes at night, they also present a downside: the interface can be more challenging to read and may even increase the risk of eye fatigue.
In this Cheddar video, Dr. Sam Pierce from the American Optometric Association explains the drawbacks of using dark mode.
White text on a dark background can create a halo effect, and the extreme contrast between the two colors might make the text more difficult to read, exacerbating eye strain.
Regardless of contrast levels, dark mode causes your pupils to dilate, a natural response to low light. While this isn’t inherently harmful, it can strain your eyes as the ciliary muscle works harder to adjust the eye’s lens, increasing the likelihood of eyestrain.
To avoid digital eye strain, which includes headaches and sore eyes from prolonged screen use, the AOA recommends the 20-20-20 rule: every 20 minutes, look at something 20 feet away for 20 seconds. Essentially, take regular breaks from your screen.
While constant use of dark mode won’t permanently harm your eyes, moderation is key. It’s suitable for text messages, occasional phone use, or watching videos and playing games that don’t involve detailed reading. However, for lengthy reading sessions, dark text on a light background is gentler on your eyes.
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