Vision / Eye Strain
Visual problems, such as eyestrain and irritation, are among the most frequently reported complaints by computer operators. These visual symptoms can result from improper lighting, glare from the screen, poor positioning of the screen itself, or copy material that is difficult to read. These problems usually can be corrected by adjusting the physical and environmental setting where the computer users work. For example, work stations and lighting can and should be arranged to avoid direct and reflected glare anywhere in the field of sight, from the display screen, or surrounding surfaces. You also can reduce eyestrain by taking vision breaks, which may include exercises to relax eye muscles after each hour or so of operating a computer. Changing focus is another way to give eye muscles a chance to relax. You only need to glance across the room, or out the window, from time to time and look at an object at least 20 feet away. Other eye exercises may include rolling or blinking the eyes, or closing them tightly for a few seconds.

Repetitive Strain Injury (RSI) :: What is RSI? Protect yourself. Identifying RSI
As many of us spend more and more time in front of computers, the chances of developing repetitive strain injury (RSI) increase. For some people, the pain of RSI is so great that it prevents them from working at all. However, it doesn't develop overnight, so by always remembering that prevention is better than a cure, problems can often be avoided in the first place. Occupational overuse syndrome, work-related upper limb injury, and isometric contraction myopathy, are all phrases used to describe what is more commonly known as RSI. Overuse of the muscles of the hands, wrists, arms, or shoulders on a repeated, and usually, daily basis, causes injury to these muscles. This results in inflammation that is never really given a chance to recover, since these everyday harmful activities invariably continue.

Your health - Headaches and eye strain
What are headaches and eyestrain? Headaches can be caused by many different factors and are one of the most common reasons people visit their GP. Most headaches are not serious and usually disappear on their own. They can be relieved by mild painkillers, or a positive change in lifestyle. Eyestrain is also a common complaint among people doing 'close' work e.g. those who work using computer monitors. Eyestrain can be a trigger for headaches, but can usually be avoided by following simple guidelines. What are the signs of headache or eyestrain? A headache can range from a mild, throbbing feeling to a sharp, stabbing pain. Headaches can affect your whole head or just a part of it. The pain may move around, affect your vision or even cause nausea and vomiting. The two most common types of headache are tension headaches and migraine. Tension headaches do not usually last for a long time. Common symptoms of a tension headache include

What things should you do if using a computer for a long time for Health reasons?
Computer work can be quite strenuous for the body, especially for the eyes, the back, the wrist and the hand. The first thing to do is to have a good position in a nice environment: comfortable straight chair, monitor and keyboard at the right height and distance, quite room, well lit. There are several ways to minimise eye strain. Modern flat screens are better than standard monitors. Also, special screen filters that fit in front of a monitor are good for the eyes.