They are drawn to movement....whatever activity is going on is where they will probably look. As long as he isn't scared or stressed it's fine but if you're concerned with him getting too much " T.V time" like many kids [ lol ] you can cover part of the cage with a light towel or by other means. In the long run it's not a big deal though.
You can put on some animal shows that would be relaxing or some nature shows to give
some enrichment or entertainment. A lot of them tend to watch TV or a movie if there is a
lot of movement.