Canon A470 - Manual (Page 109)

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Erasing
z When there is not enough space left on the memory card,
red-eye correction cannot be performed.
z Although you can apply red eye correction any number of
times to an image, the image quality will gradually
deteriorate with each application.
z Since the correction frame will not appear automatically on
images that have already been corrected once with the
(Red-Eye Correction) function, use the [Add Frame] option
to correct them.
z The correction frame will not appear automatically on
images that have already been corrected with the red-eye
correction function. Use the [Add Frame] option if you want
to perform further corrections.