Eye strain or eye fatigue can disrupt your ability to use your eyes together. Fatigue in the eyes can also cause reading issues. Eye strain is one of the most common symptoms of an unstable visual system. Eye strain symptoms include; tired eyes, blurry vision, and pain in the eyes.
Many people who report symptoms of eye strain also have great eyesight in the distance, yet just can't handle the visual stress associated with close work. Visual stress is linked to the development of permanent vision conditions such as shortsightedness, astigmatism and other problems that effect how one lives and behaves.