Why do eyes sometimes turn red in photographs?
The blood in your eyes is to blame for this phenomenon. When a flash goes off, it’s reflected on the rear of the eyeball, which is red from the blood vessels found there. There are a few ways to avoid this, including moving the flash away from the camera or asking your subjects to look slightly off andle from the camera lens. Another easy trick is to turn up the lights in the room, thus forcing the pupil to contract and allow less light in from the flash. Newer camera models include a ‘Red-Eye Reduction’ setting that pre-flashes before taking the actual photograph.
