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Flash can have a variety of uses from providing the only source of
illumination for a scene or providing “fill in” light to counteract strong
backlighting.
It can also be used to cancel the effect of ambient light which has an
undesirable color balance such as with fluorescent light, which tends to
be slightly green in color.
In this situation you will need to turn “forced flash” on, and you may have
to adjust the output flash power or change the distance of the camera to
the subject to get the ratio of ambient to flash light correct.
There is an adjustment in the REC Setup mode for Red-Eye removal,
this is a software based process which will attempt to “fix” any red eyes
which were not reduced by the pre-flash red eye correction method.
You will notice that if you have it set to “on” the icons change in the flash
setting menu to show a small paint brush alongside the eye symbol. It
works with face detection to prevent unwanted image areas being
converted to black inadvertently.
Digital (software based) red eye reduction and the paint brush
symbol denoting that you have it enabled.