The diagnosis of crossed eyes is binocular internal strabismus, which is more common in children and is usually associated with some refractive error, with moderate or high hyperopia or with astigmatism. Therefore, if it is found that a child does suffer from internal strabismus, it is best to visit the hospital promptly, usually with a dilated eye exam and more long-acting ciliary muscle paralyzing agents, such as atropine sulfate gel. The nature of the refractive error is determined based on the test results, and glasses are worn to correct it. If amblyopia is found to be manifested, amblyopia treatment is performed at the same time, and the eyes can be alternately covered for amblyopia treatment. If the inward slant of the eye position is still obvious after correction by glasses, it is recommended to consider surgery to correct the eye position as soon as possible.