What is the purpose of the red eye tool in photoshop?

Photoshop CS6 offers a solution to get rid of the dreaded red eye. Red-eye occurs when the subject of a picture looks directly into the flash, and the unfortunate result is that eerie reddish luminescence in the eyes that says, “I may very well be a demon child.”Many cameras have a red-eye prevention mode, but that’s little solace when you have a great picture that features bright red pupils as its most dominant feature.If you’ve been hanging around in Photoshop for a while, you’re probably aware that you can get the same result many different ways. You can use the regular Brush tool with a Color blend mode and paint away the red. Or you can use the Color Replacement tool with a black foreground to color away the crimson. Additionally, you can use the Red Eye tool.If you need to fix the green, blue, or yellow eye that occurs in animals, the Red Eye tool isn’t effective. You will want to use the other two techniques mentioned above.Follow these steps for a quick way to get the red out and restore your image to a less zombielike look:    Open the original photo with red-eye showing.    Select the Red Eye tool.    Using the default settings, click the red portion of the eye in your image. This one-click tool darkens the pupil and retains the tonality and texture of the eye.     If you’re not happy with the results, tweak one or both of the following options:        Pupil Size: Use the slider to increase or decrease the size of the pupil.        Darken Pupil: Use the slider to darken or lighten the color of the pupil.    If all goes well, your image is now cured of the dreaded red-eye.The Red Eye tool works only with RGB or Lab color images.