The effect of using night mode or turning on the desk lamp to read a novel on the eyes mainly depended on the intensity and brightness of the light. Using night mode could reduce the blue light emitted by the screen and reduce eye irritation. However, night mode does not eliminate all blue light, so it still needs enough light to ensure the health of the eyes. If the light is too dim, the eyes need to constantly adjust their focus to adapt to the light, which may cause fatigue and discomfort. If you plan to use a table lamp to read a novel, you need to consider the brightness of the table lamp and the direction of the light. If the brightness of the table lamp is too high or the direction of the light is not correct, it may cause damage to the eyes. Therefore, it is recommended to use a table lamp with moderate brightness and the correct direction of light and point the table lamp in the direction of reading to reduce glare and irritation to the eyes. In short, using night mode or reading a novel with a desk lamp on required the appropriate light and direction to ensure the health of the eyes. It was best to choose an appropriate method based on the actual situation.