If you're a student or if you sit at a desk all day, you probably complain of neck pain, tension headaches, and a lot of tension in the shoulders.
Looking down for several hours a day can put a lot of stress on the neck muscles and the cervical spine. Over time this can lead to premature degeneration of the cervical spine and even put you at a higher risk for disc injuries.
To prevent chronic neck flexion and that pains that comes with it, a simple solution is to buy a copyholder. This allows you to read at eye level and maintain a more natural curve in your neck.