Rainfeather, 

While researching monitor calibration. I recently read that adjusting the refresh rate of your monitor can sometimes eliminate the headaches that people get from staring at their monitors.  I read that a general rule of thumb is to set it one setting lower than the top recommended refresh rate of your particular monitor.  For instance; mine is a Samsung LCD with a refresh rate range of 60 to 75, so I set it at 70.  This made quite a difference in clarity.  Hope this helps as well.