Change Eye Color

To change the colour of eyes

1. use the Brush tool and change its mode to Hue in the Options bar. 
2. Lower its Opacity down to 50% and 
3. click on the Foreground colour swatch to choose a new hue for the eyes. 
4. Paint over with a Soft Round brush to prevent hard edges and, because it’s set to Hue, the pupils are un affected.