1. Most strabismus that occurs in childhood has no obvious symptoms, and a few school-age children will show signs of visual fatigue, and parents will mistakenly believe that their children are averse to school. 2, most strabismus is initially intermittent, often appearing when fatigue, dazed or fever and other physical discomfort, careful parents can often find, some often neighbors or school teachers feel that the child’s eyes are not normal to be found, the family because every day with the child, but see the “strange” not “. The family members, because they are with their children every day, see “strange” but not “weird”. 3. The majority of children with internal strabismus become permanent soon after the appearance of the eye, or the strabismus is often present, so it is easier to detect and diagnose at an early stage than with external strabismus. However, because many children have a wide inner canthus and a wide nasal bridge, they sometimes look like “opposite eyes” (internal strabismus) and are found to have a “pseudo-intraocular strabismus” after professional examination. This situation is more common in our Oriental peoples. 4, crooked head to see things is sometimes a problem of the eyes rather than the neck, which is often not understood by people, why crooked head to see an ophthalmologist, it is because when the child suffers from upward strabismus (vertical strabismus), the body in order to compensate and take a special position, the medical referred to as compensatory head position. 5. Closing one eye outdoors or in the sunlight is one of the common manifestations of certain intermittent strabismus. These patients only show the abnormal situation of closing one eye outdoors or in the sunlight, while no abnormality can be seen in other cases.