For the magick practitioner wishing to test their skill, there is a way to do this. It is more difficult and takes much practice. It's also completely natural. You must be relatively advanced as a witch to use the magical method, but once you learn it's fun and entertaining. This type of magic is commonly called a glamor. It is really just a matter of taking a desire and making it surface so that it is visible to other people.
Close your eyes. You must have complete focus and be concentrating only on changing the eye color, any other distractions must be cleared from the mind. Now fill your mind with the color your eyes are, right now, naturally. Now see that color slowly change to the color you wish your eyes to become. See it overpower your natural color. Imagine that the color shines like a ray of light from inside your mind out through your eyes. Visualize your eyes becoming that color as the light passes through them. (This process should take at least 15 minutes the first few times, and you will have to repeat it after awhile. Glamors fade as you "forget" them.)
Upon opening your eyes, you may or may not be able to see the change in the mirror. For a more accurate check of whether it worked, ask someone what color your eyes are. If they know you really well they may see past the glamor. (Your parents may see past it, and often spouses or very close friends, because they know you too well.) The stronger you develop the talent to throw a glamor, the more people it can trick. It will take you practice. Good luck!
