The blue color of the white of the eyes may be a normal physiological phenomenon, or it may be caused by hepatitis B, scleritis and other disease factors. 1. Normal physiological phenomenon: the sclera of infants and young children is relatively thin, and the color of the deep tissues can be seen through the sclera, and these tissues are rich in blood vessels, which leads to the bluish whites of the eyes of infants, and this situation will generally be gradually alleviated with the growth of age. 2. Hepatitis B: If the patient is infected with hepatitis B virus, which causes abnormal immune response and liver damage, it may lead to yellowing of the sclera and skin of the patient, which is also called yellow stain, and when the yellow stain is lighter, it will be greenish. 3. Scleritis: patients with scleritis may have diffuse congestion of the sclera, conjunctival edema, and some patients may have blue-green color of the sclera. It is recommended that patients with cyanosis of the whites of the eyes and other discomforts should consult a doctor promptly for evaluation of their condition and treatment as prescribed by the doctor.