Well, as you can see, yellow eyes is one of the most complicated and serious problems with eyes, and basically it is very dangerous for it leads to a lot of symptoms and other problems with our vision, eyeballs, etc. The causes of that is various, including some eye infections, bad use of eyes, and some other diseases on other parts of our body. So, all I can say is that you should take care of your eyes before such terrible matter come to you. Just pay attention to your use of eyes, to your diet and to your rest.