Step 4

Now change the colour to what ever you like, I have chosen Green
Select the Paint Bucket Tool
Click inside your Lasso to fill in the Colour.
You should have something that resemble the picture below.




Step 5

Double Click the Eye Colour Layer to display the Layer Style Properties
This can also be achieved be Clicking Layer -> Layer Style -> Blending Options
Change the Blend mode to Hue
Change the Opacity to 55%




Step 6

You can now go back and follow the same steps to apply similar effects to other parts of the eye. Below is and example of the eyelid being changed colour.