The causes of glaucoma are as follows: 1. Physiological factors: It is more common in infants and children, because the sclera is relatively thin and transparent in children, and it is easy to see the dark colored choroid below, thus manifesting as a glaucoma in the white of the eyes. 2. Pathological factors: It is mostly seen in adults, such as sclerositis, scleral damage, or glaucoma, as well as connective tissue diseases, iron deficiency, and local pigmentation disorders in the sclera, which can lead to local or overall glaucoma. Or glaucoma, connective tissue diseases, iron deficiency, local pigment disorder of the sclera, which can lead to thinning and translucency of the sclera and local pigment proliferation, resulting in local or overall scleral cyanosis, which requires further treatment in ophthalmology to clarify the diagnosis.