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This tutorial demonstrates how to remove green, blue and yellow (flash) eye from animals, utilising the Sponge and Burn Tools. To work along exactly, you can download the cat image Here. Unzip the file and open the image onto Photoshop’s workspace.
Removing Human and Animal Red Eye with CS2 and CS3’s Red Eye Tool
Removing Human and Animal Red Eye with the Colour Replacement and Burn Tools
General Flash Eye Notes
Red, green, yellow or blue eye, occurs when a photograph is taken with a flash. Light from the camera’s flash is reflected onto the retina at the back of the eye, and in
humans, (and sometimes dogs) results in red eye, caused by the blood vessels. Animals; including, dogs and cats, have special reflective layers (tapetum lucidum), over their retinas - similar to mirrors, and this aids their nocturnal vision. This results in the strange green/yellow/blue eyes often displayed in photographs of indoor pets, (taken with flash). As animals age, their eyes become cloudy; exacerbating the spooky appearance caused by flash.
Undo and Navigation Steps
Two ways of undoing steps are from the top menu, Edit then Step Backwards. Alternatively, click a previous snapshot in the History Palette.
Navigate (zoom in and pan) your image using the Navigator Palette,
or the Zoom Tool. 
Activate The Hand Tool by tapping the Spacebar, keeping the Spacebar pressed, pan your image in the usual way. 
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Open your start image onto Photoshop’s workspace.
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Then zoom into the eyes (View then Zoom in), and from the left-side toolbar, activate the Polygonal Lasso Tool. Comprehensive Polygonal Lasso Tool Lesson Here!
And set the following Add to selection and Feather 2 px attributes into its Options bar.
Now, carefully click-and-stretch a lasso line around the left-side pupil, then
click-and-stretch a lasso line around the right-side-pupil - as illustrated below. Remembering to tap the Delete or Backspace key - to step backwards.
After you have completed this, both pupils will be tightly isolated with a selection marquee - as illustrated below. You are now ready for the next step.
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From the top menu, choose Adjustments then choose Desaturate. This removes the pupils’ colour, converting them to greyscale. Alternative Removing Colour Tutorials.
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Alternatively, from the left-side toolbar, activate the Sponge Tool.
And set the following Desaturate settings into its Options bar.
Then paint inside the selection marquees, to remove the pupils’ colour.
Sponge Tool Note
Depending on whether you choose Desaturate or Saturate, the Sponge Tool, when repeatedly applied, either removes colour - turning it to greyscale, or enhances (deepens) the colour’s saturation.
 
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To darken the pupils further, (ensure the marquees remain), then from the toolbar, activate the Burn Tool. Lesson.
If you are working with my start image, set the following attributes into the Burn Tool’s Options bar.
Burn Tool Notes
Depending upon the pupils’ colour - you may need to experiment with the Range and Exposure settings.
Tip
Quickly adjust the brush size by tapping your keyboard’s bracket keys - ensuring your keyboard is set to lower case.
Now, ensure the Brush Size is larger than the pupil, then hover your cursor over the left eye, and repeatedly left-click until the pupil is darkened to a hue you like.
 
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Repeat Chapter 5, this time darkening the right pupil, then tap Ctrl then D to remove the marquee.
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Soften any harsh lines between pupil and iris, using the Blur Tool, set to a very low Strength. Blur Tool Lesson!
 
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Then save your work.
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