Red eyes are usually caused by the camera's flash when the subject in the pictures is looking directly at the camera. Even through it's called the Red Eye, this phenomenon can happen in other colors as well, such as yellow or even green.

To remove red eyes in the picture

1. Open the image in the View & Edit area
2. Choose Image > Enhance > Remove Red Eye
3. If the image is not in RGB full color mode you will be prompted to convert the color mode, press YES to enter the effect mode for Remove Red Eye
4. For each red eye, drag the image in the effect control panel until the pupil is centered at the crosshair
5. Adjust the Zoom factor and Pupil size sliders until the pupil area is well covered by the center rectangle
6. Look at the preview image in the main work area to observe the effect of the fix
7. Press the Apply button to fix one red eye
8. Repeat steps 4 through 7 until all red eyes are fixed