Dry Eye Syndrome
Dry Eye Syndrome is effectively when your eyes are not being sufficiently lubricated in the natural way. This is predominantly due to your tear ducts not creating enough moisture, or the fact that the moisture being produced is evaporating too quickly.
This can be caused by a number of external factors such as air conditioning and lighting. However, the reason that you are experiencing dry and uncomfortable eyes is more than likely a result of putting your eyes under too much strain. This is often due to over use of technology such as computers, televisions and smart phones.