Zhu Siquan, Director of the Ophthalmology Center of Beijing Anzhen Hospital Affiliated to Capital Medical University, said: First of all, we need to sit horizontally and look at our phones. At this point, our eyes are in a relatively relaxed state. Secondly, the distance we look at our phones is very important, usually around 50 centimeters. If it exceeds 70 centimeters or is below 30 centimeters, the eyes need to adjust their muscles to see the content on the screen clearly. Our muscles are in a state of adjustment, which can easily lead to visual fatigue, and for children, it is very easy to induce myopia or worsen myopia. Experts recommend that controlling the brightness of the phone to around 50% is more appropriate when using it under normal lighting. Zhu Siquan, Director of the Ophthalmology Center of Beijing Anzhen Hospital Affiliated to Capital Medical University: Generally speaking, the brightness of mobile phones should not exceed 70% and should not be less than 30%. If it is too dark or too bright, we need to see the object clearly, and the muscles of the eyes must be in a regulated state, which can easily cause visual fatigue. Experts also told reporters that using a mobile phone when the lighting conditions are poor, or when walking, exercising, or taking transportation, can exacerbate eye muscle stretching, which may lead to a decrease in vision in the long term. Especially now, many people's behavior of running on the treadmill while watching their phone is not worth advocating. Nowadays, many people use anti blue light glasses, so what are the benefits of wearing anti blue light glasses when watching a phone? Zhu Siquan, Director of the Ophthalmology Center of Beijing Anzhen Hospital Affiliated to Capital Medical University: Anti blue light glasses can have both advantages and disadvantages, because our eyes still need blue light. If we prevent all blue light, it may lead to poor sleep and rest. But excessive blue light can indeed damage our eyes, so if you spend a lot of time watching your phone or computer, it is still effective to wear a pair of appropriate anti blue light glasses. If you don't spend a lot of time watching your phone or computer, it is generally not necessary to wear anti blue light glasses specifically. (New News Agency)