cannon ixus 850 is(710萬像)開左防紅眼仲有紅眼既??

http://en.wikipedia.org/wiki/Red-eye_effect
the above link can answer all your question o ...
同好多鬼好鬼仔影個時,,佢地隻眼影出黎好紅...
correct AH,
The effect is generally more pronounced in people with grey or blue eyes and in children. This is because pale irises have less melanin in them and so allow more light to pass through to the retina. Children, despite superficial appearances, do not have larger pupils but their pupils are more reactive to light and are able to open to the fullest extent in low light conditions.