Absolutely yes, it could damage your eye vision. The car keeps moving with irregular movement due to there is various condition on the road, such as traffic lights. When you are on a car, there is unstable distance between your eyes and the article. That is to say, it is not easy for you to continue focusing on the article based on movement. On the other side, it could be easier for you to feel eyestrain due to your eye muscle need to be more focused on the article. It could make your eye vision if you continue do that for 5 hours.