If it is a kitten that is one or two months old, it is normal for the eyes to turn yellow, because the cat’s eyes will have a blue film when they are just born, which will slowly fade as they grow; if the cat’s eyes suddenly turn yellow when it grows up, Yellowing may be caused by disease. General parasitic infections, fatty liver, onion poisoning, tumors, autoimmune diseases, cholangitis, etc. can cause cats' eyes to suddenly turn yellow. It is best to go to the hospital for examination and treatment in time to avoid affecting vision.