Yellow eyes are firstly considered to be caused by aging, and secondly, it may be caused by blepharospasm, viral hepatitis and other diseases. 1. Ageing: As we age, the corneal endothelial cells will decrease, leading to degenerative changes in the cornea, which will lead to yellowing of the eyes. 2. Blepharospasm: Blepharospasm is a yellow nodule located in the adult blepharospasm area where the corneoscleral rim connects. Long-term exposure of patient’s eyes to ultraviolet radiation, smoke and dust stimulation, etc., may cause pigmentation, which may lead to the phenomenon of yellow eyes. 3. Viral hepatitis: viral hepatitis is mainly caused by human infection with hepatitis virus, and the patient mainly manifests symptoms such as fatigue, abdominal distension, and yellowing of the sclera of the eyes. There are many reasons that lead to yellow eyes, it is recommended that patients go to regular hospitals, standardized treatment under the guidance of doctors. Patients need to rest more, do not stay up late, pay attention to eye hygiene.