There are more reasons for patients to have a circle of blue color around the pupil, mainly including corneal degeneration, hepatomegaly, ethnical iris differences, lipid deposits and so on. 1. Corneal degeneration: In the case of limbal corneal degeneration, under the influence of autoimmunity, ring-shaped ulcers may appear on the limbic part of the cornea, and the ulcers are prone to scarring, and a blue-gray circle may appear around the pupil from the outside. 2. Hepatomegaly: If the patient has hepatomegaly, a ring of corneal pigment may appear at the edge of the cornea of about 1-3 mm, and its color is similar to blue. 3. Ethnic iris differences: there are differences in iris color between different races, in the case of Oriental people, if there is a mixed situation, there may be a blue ring around the pupil. 4. Lipid deposits: With age, some elderly people may have lipid deposits at the junction of the eyeballs, making the originally transparent cornea appear blue-gray. It is recommended that patients with iris color abnormalities and other discomforts seek prompt medical attention to evaluate their condition and follow the doctor’s instructions for treatment.