I am experiencing a serious issue with my eyes when I look at the screen, but I don't face any problems when I read books. I also have a problem with light sensitivity when exposed to fluorescent light, which causes glare. After looking at the screen for just 5 minutes, my eyes start to feel very tired and strained. I also feel that the muscles around my temples are stretched and tense. If I continue to stare at the screen for more than 15-20 minutes, my muscles around my forehead and neck get very tired and stretched, and I am unable to focus on anything, not even reading a book. I feel like I can't think anymore, and the only way to get relief from this state is to lie down on the bed and do continuous forced yawning until the muscles around my eyes and forehead are relaxed. Only then can I sleep and carry out other activities. However, my yawning is not natural, and I can feel hot air coming from my mouth whenever I stare at the screen. I can easily read books for 8-9 hours, but whenever I look at a screen, be it a computer, TV, or mobile phone, I can't tolerate it. In my case, my eyes are not affected that much, but the muscles around my forehead and neck get very hard and stiff. It becomes difficult for me to sleep at night, and when I try to read something, I can only read one page of a book for one hour. When I go outside for a walk and do forced yawning, my vision improves, and there is some stiffness over my forehead muscles which get relaxed, and I can easily focus on anything. However, when I increase my screen time for very long periods like 1 hour, my muscles get stiff, and I have to do forced yawning, go outside, and try to sleep. For 3-4 days, I am unable to sleep, and my body doesn't get rest, resulting in very low energy levels. Even if I try to shout, the person sitting next to me can only hear me faintly, if at all. I have tried drops and vision therapy, but they haven't worked. I don't have convergence insufficiency. What should I do now?