Red-Eye in Photos is a Reflection of Your Blood

When the flash of a camera goes off, the eye isn't prepared for the sudden influx of light and the pupil doesn't have time to restrict. In addition to this, when taking a photo, you are likely using flash in dark lighting. At that point, the eyes would have already dilated to adjust to the dark room. When the flash goes off and the photo is taken, your eyes are still dilated, so the light reflects off of the red blood vessels of the choroid, which is the layer of the connective tissue in the back of the eye that nourishes the retina.

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