Users were startled to learn why people have red pupils in the photo
A group photo in the dark can be ruined because everyone's eyes will be red due to the flash. But there is a very specific explanation for this. SSPDaily tells about it.
The reason for red pupils was revealed in a TikTok video by Nicholas Grant, who posted a clip on his account explaining the interesting scientific reason for this phenomenon.
He said: "You've probably heard that red-eye in photos is caused by the flash bouncing back into the camera, but it turns out that it's actually a little more interesting than that. If you're in a dark room, your pupil opens very wide, letting in light, and that's exactly the situation where you should use the flash. Normally, if your eye sees a bright light, it closes. But the flash is too fast for the pupil to react. The dilated pupil causes red eyes. That's why some cameras use a dual flash – one to close the pupil and another to take the picture."
Nicholas also answered the most important question: why pupils are red. The red hue is caused by the blood vessels in the eyes. He added: "It turns out that the color you see is a flash illuminating the inside of your eyes, and it gets the red appearance because of the blood vessels in your eyes."
@nicolas_grant
Why do you get red eyes in photos?
♬ original sound - Nicolas Grant
However, according to the American Academy of Ophthalmology, seeing red when you take a picture with a flash is actually a good thing because it means your eyes are healthy.
"The red reflex occurs when the camera's flash illuminates the blood-rich retina. If your eyes are looking directly into the camera lens and the color of the reflex in both eyes is red, it's usually a good sign that the retina in both eyes is free and healthy."
However, even knowing that this is a good sign, some commenters on the video were still horrified:
- So this is literally us seeing the inside of our eyes?
- It's a little creepy, I'm not lying.
- It's freaking scary!
