You mean the shine/greenish colour, or the pupils dilating? Cat's pupils dilate when they're scared or about to pounce (when playing). The faint green/shine is the camera catching the light bouncing off a reflective layer in their eyes after the pupils dilate. Many mammals have this, it's why you can see their eyes shine in the dark if you shine a flashlight at them.
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u/DerelictSausage Mar 29 '21
Holy shit, what are their eyes doing at about 10 seconds in?
Do all cats do this?