Eyestrain occurs when your eyes get tired from focusing on something for a long period of time. Common activities that can lead to eyestrain include computer use, driving, and reading for extended time periods. Straining to see in dim light or looking into a bright light can also cause eyestrain. Symptoms may include sore, tired, burning, itchy, watery, or dry eyes; blurred vision; headache, or increased sensitivity to light.
Most people who use a computer regularly and for extended periods of time will experience some form of eyestrain at some point. In addition to the symptoms above, eyestrain corresponding to computer use might cause the user to have trouble focusing or to see residual spots of color when they look away from the computer monitor.
You can reduce your risk for eyestrain by paying attention to your light sources and taking breaks. When working with items close up, make sure you have a light that is bright enough and directed at what you're working on. When reading, light should shine on your material, not directly into your eyes. If you spend a lot of time looking at a computer screen, take frequent breaks to focus on something away from your monitor.
It's important to note that stress and fatigue could put at a greater risk for eyestrain. Unfortunately, eyestrain could potentially make these factors worse by making you more tired and making it harder to concentrate.
Typically, eyestrain isn't serious and will go away when your eyes have a chance to rest. If symptoms don't go away, they may be indicators of a more serious eye condition, and it would be wise to consult an eye doctor to determine any underlying causes.
Source: JJ Keller