The e-book mode of a tablet computer was not eye-friendly because the screen of a tablet computer usually used an LCD screen, which had a high color range and contrast, and could clearly display text and images. In contrast, the e-ink screen used in ink-screen e-books had a lower contrast and color range, so it was more likely to cause eye damage when reading for a long time. In order to protect your eyes to the greatest extent, it is recommended to choose the eye-protection e-book mode. Some tablets were equipped with a reading mode that could adjust the brightness, contrast, and color temperature of the screen to reduce eye irritation. In addition, choosing a high-quality e-book reader such as an ink screen e-book or a tablet with a high-brightness LCD screen can also better protect your eyes.