There are three possibilities for patients with chickenpox to have red eyes: 1. It may be fever, in the case of fever human capillaries are dilated, and some people will show dilated capillaries in the eyes, which shows that the eyes look red. 2. Systemic chickenpox, which is the spread of chickenpox to the whole body, is called disseminated chickenpox. In the case of disseminated chickenpox, many organs or tissues of the body will be infected with the chickenpox virus, and when the chickenpox virus infection invades the conjunctiva of the eye it may also lead to red eyes.3. Red eyes and chickenpox may not have much to do with each other because there are eye problems at the same time, such as trachoma caused by Chlamydia trachomatis will also manifest as red eyes, but there is no relationship between trachoma and chickenpox.