We might not know but every time we take a look to our computer screen our eyes are doing an incredible and silent job.
Any computer, tv or cinema screen works on cicles (like movie frames) wich are needed for refreshing and redrawing all the information that is delivered to the screen in different ways so if we take a look at any of these devices we might not have a clue that is actually turning on and off from 50 to 75 times per second and here is where the miracle is done without even knowing. You believe that guys!! 
The amazing job that the eye does is to take an average from the last cicle steady the signal and send it to the optic nerve in an understundable way for the brain, all this in an incredible short period of time. This can be demostrated if you take a video camara recorder and film a screen, you see the cicles because the camara does not steady the signal.
It is not very common to hear this from a sales man who is trying to sell you one of these devices but is one of the reasons why we get tired just for looking at the screen.
These are some hints for easing the pain.
- Use LSD screens.
- Use big screen in order to place yourself as far as you can.
- Try to have natural ambient light or whatever looks like natural ambien light.
- Use antireflex glasses and screen protectors.
* Get regular, diversed exercise
* Take at least 5 mins every hour for some stretching
I really wish we have harmless devices to make our health better in the future. 
Edited by Jose (2005-02-28 04:05 PM)
_________________________
Life is fine.
