Try to Avoid Reading on the Move. Motion sickness can get much worse if you focus your attention on the things inside the bus. Your peripheral vision will register the movement and create a contradiction in the brain. That's where the bus sickness begins.

You should avoid reading on a bus primarily to prevent motion sickness, which is caused by a sensory conflict in the brain. When you read, your eyes are fixed on a stable, stationary page or screen, telling your brain that you are still. However, the vestibular system in your inner ear detects the constant vibrations, turns, and speed changes of the bus, telling your brain that you are moving. This "mismatch" of information can lead to nausea, dizziness, and headaches. Some evolutionary theories suggest the brain interprets this sensory confusion as a sign of hallucination caused by poisoning, triggering a "purge" reflex (vomiting). While it doesn't physically damage your eyes, the strain of trying to keep your eyes focused on moving text can also cause significant eye fatigue and "accommodation stress." If you must consume content on a bus, listening to audiobooks or podcasts is a much safer alternative that keeps your senses in harmony.