10 months ago
Last edited at 11:41PM on 2/25/2013
Retina Reflection..Red eye in pictures is caused by the flash reflecting from the retina in the person's eyes. It's especially common with indoor pictures, because your pupils are dilated to adjust to the low lighting. If the pupils are dilated, there is a bigger chance of getting a reflection from the retina from a bright light source, like a flash.