"Red-Eye" is caused by...

• A. Light reflecting off the subject's clothing
• B. Light reflecting back from the retina of your subject
• C. Sensor overheating
• D. Incorrect white balance

Answer: (B)

Red-eye happens when a flash is used in a dim setting and the light from the camera flash enters the pupil, reflects off the retina at the back of the eye, and travels back through the pupil to the camera. The reflection comes from the blood-rich lining behind the retina, which is why it appears red in the photo. This effect isn’t caused by light reflecting off clothing, nor by the sensor overheating or incorrect white balance—the first is a fabric glare, the second would show different image artifacts, and the third changes overall color rather than the specific eye reflection.