WHAT IS RED EYE REDUCTION?

It's the red eye tool removal or reduction due camera flash and reflects to the eye that cause a red light on eyes to remove it, on adobe photohsop cc click filter and go to camera raw filter and on basic tab click the eyetool there is an adjustment of darken and pupils size option...

This haapens in old day's... current tec. camaras having the option for red eye reduction. If you are facing the problem,,, use photshop filter.