The most important thing you can do is to properly let your eyes rest when you’re not working. It’s useful to memorize the “20-20-20” rule (for the metric system, that can be changed to the “20-6-20” rule). Simply put, each time you use your eyes intensely for 20 minutes, stop and stare at an object about 20ft (6m) away for 20 seconds. By doing so, you can quite effectively rest your eyes.
In addition, other than rest, creating a comfortable environment for your eyes can also reduce strain. As mentioned earlier, when lighting is insufficient our eyes require more effort to focus. Therefore, using a desk lamp to give our work environment enough lighting is obviously essential. Besides adequate illumination, take care of the brightness level within your field of vision, especially when a screen is the focus of your work. If screen brightness is greater than that of the surrounding environment, it’s easy for eye strain to occur. It’s then necessary to reduce screen brightness or add light to the surrounding environment by using lamps purpose-designed for screen reading.
It is still worth mentioning that eye strain is sometimes a symptom of a serious condition such as macular degeneration, cataracts, glaucoma, and others. If your eye strain problem persists for a long time despite efforts to relieve it, make sure to consult an eye doctor as soon as possible.