Changing Eye Color in Photoshop
Open a image and Click and drag the Background layer over the New Layer icon to duplicate the layer as a safety step. Also select the Zoom Tool and zoom in to enlarge the eyes.
Click the Eyedropper tool.
Click here and select 3 by 3 Average.
Click in the iris to set a reference color as the foreground color.
Click the Brush tool.
The Options bar changes.
Click here to open the Brush Picker.
Drag the Master Diameter slider to set a brush size just smaller than one-half the iris.
Click and drag the Hardness slider to 50 percent.
Click the Airbrush button to enable it.
Click the Foreground Color box in the toolbox.

The Color Picker dialog box appears.
Click and drag the Hue slider to another color.
Click OK to close the Color Picker.
Click here to add a new empty layer.
Click here and select Color for the layer blend mode.
Click and drag over both irises to paint in the new color.
Click the Eraser tool and erase if you paint over other areas.
Click here and drag the slider to the left until the eye color appears natural.
The eyes now appear the new color.