I'm not 100% sure about that. Please hear my reasoning. I understand magic cannot make the physically impossible, possible, but, human beings eye colour is changeable. Geneticly. I have a friend whose eyes change very slowly over the course of his life. At birth they were green, became blue from photos I saw of him in kinder garden and were yellow for a while. They were grey recently but have been taking on a blue green colour recently. So it is possible for eyes to change colour. I do not think there is a way to overnightor even over a year change your eye colour, but iI don't quite think its impossible. By the same principals of magick that promoted healing by having the life energy from one person shared with another to increase the healing rate, I do believe that it could in theory be magickally possible. Not easy or maybe not doable in practical time, but I seriously doubt its impossible. If you don't agree I understand, buy I just wanted to chime in my thoughts as well, despite being quite the novice.