Well, of course not. It will not be bad to have reading while eating. First, you should know that reading and playing video-games can not be bad. On the contrary, the inactivity is bad. Generally speaking, what you eat will have an effect on your health. Obviously, if you eat a good low-fat, high protein meal then you don't have to worry about anything, but if you've just eaten something fattening and then sit down and do nothing afterwards, it can just be harm to your health. But you should remember that there is nothing to do with your eyes. But on the other hand, your sitting position will influence your sights, in some degrees. So just sit in a right position. Also, the light will also be important.