The whites of some people’s eyes look blue, mainly due to the thinning of the sclera, and the blue or cyan feeling of the uvea under the sclera can be seen, which is actually caused by the increased transparency of the sclera. Some patients with iron deficiency anemia have reduced iron intake and reduced scleral collagen secretion, which can lead to uneven distribution of scleral collagen, causing local thinning and revealing blue whites of the eyes. In addition, some of them may be due to intraocular inflammation, like uveitis and glaucoma, which can also cause gradual thinning of the sclera due to intraocular inflammation or pressure changes. So. There are many different causes of glaucoma in the whites of the eyes.