Searches the selection for pixels in which the red component dominates, and removes the red from those components. The sensitivity slider selects the sensitivity of the red detection. A value of +255 will cause all pixels to be detected as red, while -255 will prevent red-eye detection. The default of 0 is usually the best choice.
To speed red-eye correction, the "Auto Red-Eye" menu item will automatically choose the default sensitivity of zero.
To use, select the red eyes in the image. It is OK to include bits of the iris, highlights in the pupil, and even skin; these will not be affected. If you don't like the results, undo and try again with a different sensitivity.