That is the white of the eye which is the necessary part of the eyes. When the white of the eye becomes yellow, it may appear jaundice. Many diseases can cause this kind of symptom, like contagious liver, bile, duct disease, pregnancy poisoning and so on. In addition, the hemolytic disease can also cause the jaundice. It is commonly known as yellow disease which is a kind of serum bilirubin rise due to the skin mucous membrane and sclera. Sometimes, the problem in the liver may cause such symptom of yellow parts of the eyes. You are strongly suggested to go to the hospital and accept diagnose. You should accept the treatment as soon as possible to avoid other eye problems. You should not let it affect your vision by taking the treatment in the early time.