Step One
It is really not hard to change the color of eyes. Although there is a lots of way to do it, I consider this is the easiest way. Firstly of all, open up the image that you would like to change the eye color. Here, I will use a picture of Hillary Duff.
Step Two
Using any selection tool that you feel comfortable to use, select the eyes that you would like to change the eye color.
Step Three
Click Ctrl+J to make a new layer of the selection.
Step Four
Go to Image>Adjust/Saturation (Ctrl+U) and when the dialog box appear, make sure that Colorize box is checked. Now play around with the Hue Slider to choose your color. Voila, you changed the color of the eyes! Does not she look wickedly sexy with green eyes?
More Tutorials: 
i tryin to chang the eye colors on my images but i can find wat tool you're tellin me plz someone help me