If you spend long hours in front of the computer, you should try WorkPause.
You already know how the computer usage can lead to back pain, eye strain, repetitive strain injury (RSI) or other computer-related illnesses.
By using WorkPause, you can efficiently protect yourself against these risks. It will make sure you get enough rest, reminding you when it's time for a break, and keeping track on how much time you spend working or resting.
And WorkPause is more than just a break reminder. It can be discrete and unobtrusive, sitting in the system tray and notifying you with just a simple tool tip, or it can be set to lock the entire screen for the duration of the break. It is simple to use, easily configurable, flexible and elegant.
Free trial is available.

• Break Time 2.1.2.1
  Break Time is a rest break reminder designed to prevent RSI (Repetitive Strain Injury), OOS (Occupational Overuse Syndrome), CVS (Computer Vision Syndrome) and other...

• My Rest Break 1.0
  My Rest Break reminds you to take regular breaks while using computer