Watching videos and reading books on the phone were harmful to the eyes. Staring at the detailed images on the phone screen for a long time may cause eye fatigue, headaches, dry eyes, and other discomfort symptoms. In addition, videos on mobile phones usually used high frame rate and high resolution images, which would further increase the burden on the eyes. In order to reduce these dangers, it is recommended to use the phone for no more than 15 minutes per hour and to reduce the screen brightness and contrast as much as possible, as well as the video resolution and frame rate. In addition, when using the phone, you can also take some measures to reduce the burden on your eyes, such as proper rest, maintaining distance, adjusting the light, etc.