The Science of Why Our Eyes Glow in Photos

Why do some photos show glowing or red eyes?
1️⃣ When a camera flash hits the retina, light reflects back, creating the effect
2️⃣ The red-eye effect happens because blood vessels at the back of the eye reflect light
3️⃣ Animals like cats and dogs have a special layer called tapetum lucidum, which makes their eyes glow green or blue
4️⃣ This layer helps them see better in the dark by reflecting extra light
5️⃣ Photographers reduce red-eye using special flashes that make pupils shrink before the photo
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