Red Eye
From Nikonians Wiki
The effect of red colored irises from subjects. It is caused by a combination of factors, low ambient light asking the irises to open more than regularly and small angle between the angles of both the lens axis and that of the flash light. The light bouncing from the back of the retinas brings back into the image the red of the blood vessels. Big eyes don't help either. Red eye can be reduced and even eliminated in several ways: by increasing the ambient light, increasing the angle between the lens and the flash beam with a bracket, having the subject look into a direction other than the camera, or into a bright light, or simply by using a flash with a red-eye system which pre-flashes to close down the irises of the subject.
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