Canon A650 IS - Manual (Page 144)

Playback/Erasing 142
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.