The blue color of children’s eyes may be a normal physiological phenomenon, or it may be caused by congenital glaucoma. 1. Normal physiological phenomenon: due to the child is still young, its sclera development is incomplete, relatively weak, so the choroidal vascular plexus will be more obvious, and the phenomenon of the whites of the eyes bluish. Generally, if there is no other uncomfortable symptoms, no treatment is needed, and it can disappear with the growth of age. 2. Congenital glaucoma: due to the abnormal development of the atrial angle tissue in the embryonic period or the developmental period, the intraocular pressure rises due to the abnormal circulation of the aqueous humor after birth, which is called congenital glaucoma. In addition to the bluish color of the white of the eye, it is often accompanied by eye swelling and vision loss and other discomforts. Surgery is the most common treatment to reduce intraocular pressure. Children with blue eye, if accompanied by physical discomfort, should be taken seriously, and timely medical examination, so as to avoid delays in the condition.