We often encounter parents or teachers complaining about their children’s inability to concentrate, lazy eyes, frequent mis-copying of words or misreading of lines when studying, and easy fatigue in reading. Parents and teachers usually think that their children are not serious in their studies, have poor initiative and do not pay attention to lectures. In fact, this is not true. It is likely that the child has intermittent exotropia, a common eye disease in children. This condition is not rare in clinical practice. This type of strabismus occurs sporadically, often when the child is tired, drowsy or unwell, and requires the attention of parents. In addition, when children suffer from obvious refractive errors, such as farsightedness, astigmatism, myopia, etc., they are prone to eye fatigue after looking at things continuously, especially after using their eyes at close range, and over time, children will also show inattention when studying; there are also less common cases, such as children’s binocular coordination movement disorders, collection capacity and other binocular visual function abnormalities, which can also lead to eye fatigue when studying, and manifest as inattentiveness. Therefore, if parents or teachers find that the child is unable to concentrate and easily distracted, they should also think of taking the child to a hospital for a detailed examination of the strabismus specialist for early detection and treatment. The teacher always reflected to the parents that the child was inattentive and inattentive in class, and his eyes were always looking out of the window, but the child felt very aggrieved and thought that he was listening carefully, but his eyes were easily tired when he was writing homework. After an examination, the child was found to have intermittent exotropia, which was cured by surgery, and both parents and teacher reported that the child was able to concentrate.