There are several different things that can lead to eyestrain symptoms. When the muscle inside of the eye that controls focusing is overworked, symptoms can occur. In many cases, these symptoms will not start immediately, but only after several hours of work. When the muscle in the eye becomes fatigued, the eyes may feel uncomfortable or ache. The vision may blur off and on. A mild headache can occur if the eyes continue to work. In some cases, the muscle within the eye can become so fatigued that it cannot fully unfocus, leading to blurred distance vision.
Eyestrain always happens when your eyes get tired from excessive or intense use. It is vexing. However, it will disappeared with enough rest. Moreover, eyestrain usually begin to appear after extended computer use, reading, straining your eyes in dim lighting, or during activities that involve prolonged visual tasks. Although it's not often a serious condition, eye strain could be a symptom of an underlying problem. Eye strain is known to cause fatigue, difficulty concentrating, and headaches.