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How to change eye color in photoshop 
Find your subject and load it into photoshop. 
This could be a simple copy and paste from your browser or opening the file and editing it there. 
Use the circular marquee tool to generally select the iris area.

pick from the following.
(1). Use shift + the marquee tool to add another selection without losing the first one. Press' q' to enter quick mask mode.
(2). You can also zoom in or out by pixelling the iris using the zoom tool. Use the toggle switch near the logo logo to enable " ink shutdown " or " ink gloss.
(3). This area does not have to be very wide, it can be narrowed to a few parts. Clicking the mouse + b key would highlight image] preview.
(4). The best way to do this is in step 4. Blend or blur by creating an image with transform.
Answer:
(1).