What is a recommended measure to prevent headaches when working on a computer?

Taking frequent breaks is widely recommended as an effective measure to prevent headaches when working on a computer. This practice is often referred to as the "20-20-20 rule," where every 20 minutes, a person should look at something 20 feet away for at least 20 seconds. This helps to reduce eye strain and fatigue that can contribute to headaches. Continuous screen time can lead to tension in the neck and shoulders, exacerbating headaches. By incorporating regular breaks, individuals allow their eyes and muscles to relax, thereby mitigating the onset of headaches related to prolonged computer use.

In contrast, using a larger screen may improve visibility and reduce eye strain for some users, but it does not directly address the strain from extended use without breaks. Keeping the room dimly lit may not always be effective in reducing headaches, as poor lighting can lead to other forms of eye strain. Adjusting the chair height can improve posture, helping to facilitate better ergonomic practices, yet it may not directly tackle the cumulative effects of sustained focus on the computer screen. Therefore, taking regular breaks is the most comprehensive method to alleviate the risks associated with prolonged screen time.