Causes of eye fatigue: 1, eye refraction abnormalities When patients have myopia, farsightedness, astigmatism, phakic eyes and other problems, in order to see things clearly, the eyes need a lot of adjustment, resulting in excessive eye strain. 2, excessive collection of eyes Excessive collection of eyes often occurs in students, when students myopic eyes and not corrected, reading, writing homework too close to the book, causing the eyes many degrees of collection, excessive collection and will cause the eyes to increase the degree of myopia, reading distance closer. The vicious cycle will also cause eye strain. 3, eye diseases When suffering from corneal clouding, lens clouding and other eye diseases caused by blurred vision, also easy to cause eye fatigue. 4, eye development abnormalities such as large pupil distance between the two eyes, the two eyes collection difficulties, easy to produce eye fatigue. 5, physical and life reasons such as lack of exercise, poor nutrition, frequent insomnia, irregular life, excessive smoking and alcohol, do not pay attention to eye hygiene, etc., are prone to eye fatigue. 6, the age of people over 40 years old, the eyes began to aging, but not timely with presbyopic glasses, eye fatigue is prone to occur.