Looking at cell phones in the dark has a greater impact on the eyes, and after a longer period of time, it can also cause patients to develop myopia and closed angle glaucoma. 1. Myopia: looking at cell phones in the dark is more harmful to the eyes, because the light stimulation in the dark is stronger, which will cause the patient’s pupil sphincter spasm, and in the long run, it will lead to myopia. In daily life, patients need to reduce the time of watching cell phones at night, to maintain good eye habits. 2. Closed-angle glaucoma: night watching cell phones cause closed-angle glaucoma, mainly because of poor lighting conditions at night, the pupil inside the eye will be too large, thus increasing the amount of light into the eye, after a long period of glare stimulation will form closed-angle glaucoma after watching. In order to avoid the appeal situation, it is recommended to try not to look at the cell phone in the dark.