As we all known, the pigmentation of the eye's iris and the frequency-dependence of the scattering in the stroma of the iris decide our eye colors. Eye color is permanent so that you must take some artificial ways to change it if you want to do. Well, if your eyes change into yellow, the most possible factor is something wrong with your eyes or liver. The famous one factor is jaundice. When the whites of our eyes and possibly our skin develop a yellowish color, which is commonly called jaundice. Jaundice makes our eyes yellow, sometimes even our palms and soles of the feet may become yellow. Plus, it is said that too much vitamin A in body will also cause yellow in eyes and skin. There is no any effective way to reduce yellow in your eyes except medicines and surgery.
