Asthenopia (aesthenopia) is the medical name given to the common eye disorder – eye strain. This condition occurs after your eyes have been taxed for a long period of time, for example after hours of intense work on the computer or driving for hours.
Fortunately the symptoms of asthenopia are fairly mild; dry eyes, itchy eyes, general pain in the eyes, headaches and back or neck pain (full list here) and all are temporary. Treatment of asthenopia involves preventative measures such as eliminating glare and moving from CRT monitors to LCD monitors. For those already suffering from asthenopia treatment is simply tasking a break from visually intense tasks like driving, reading and using a computer.