There is no causal relationship between looking at a cell phone and the development of conjunctivitis. Looking at a cell phone itself does not lead to conjunctivitis, but looking at a cell phone for a long time can cause conjunctivitis symptoms to worsen because the blue light can damage the eyes when the eyes are staring at the screen for a long time during the process of looking at the cell phone. On the other hand, staring at the screen for a long time will affect the secretion of tears, which will also lead to the most common dry eye disease. Nowadays, with the popularity of smartphones, dry eye diseases caused by cell phones are gradually increasing. If patients have conjunctivitis symptoms and brush their cell phones for a long time, conjunctivitis symptoms can be aggravated. Therefore, it is clinically recommended that patients with conjunctivitis should pay attention to avoid prolonged use of cell phones while undergoing drug treatment.