Red-eye effect
Have you ever taken a picture with a camera and noticed that the eyes of the people in the picture look red? That's what we call the "red-eye effect."
So, why does this happen?
Well, when we're in a dark room or outside at night and our eyes adjust to the low light, they open up (or dilate) to let in more light. When a camera flash goes off, it reflects off the back of our eyes (which is called the retina), which has the same bright red color of blood vessels.
Instead of reflecting back in the normal way, the light from the flash bounces off the retina and back out through the pupil, which is the black part of the eye that the light enters. The camera then captures this reflection of light from the retina, and that's what creates the red-eye effect in the photo.
To avoid red eyes, some camera makers have built-in features that help prevent it. For example, some cameras use a pre-flash to cause the eyes to constrict, so that less of the flash's light can enter the eye and reflect back. Some other cameras use red-eye reduction lights that light up to help to dilate the subject's pupils before the real flash goes off. Another solution is to use a filter on your camera's lens to reduce the reflection, or to use natural light if it's available.
So there you have it, even though it might seem a bit spooky, rest assured that red-eyes in photos are completely normal and can be easily prevented.
So, why does this happen?
Well, when we're in a dark room or outside at night and our eyes adjust to the low light, they open up (or dilate) to let in more light. When a camera flash goes off, it reflects off the back of our eyes (which is called the retina), which has the same bright red color of blood vessels.
Instead of reflecting back in the normal way, the light from the flash bounces off the retina and back out through the pupil, which is the black part of the eye that the light enters. The camera then captures this reflection of light from the retina, and that's what creates the red-eye effect in the photo.
To avoid red eyes, some camera makers have built-in features that help prevent it. For example, some cameras use a pre-flash to cause the eyes to constrict, so that less of the flash's light can enter the eye and reflect back. Some other cameras use red-eye reduction lights that light up to help to dilate the subject's pupils before the real flash goes off. Another solution is to use a filter on your camera's lens to reduce the reflection, or to use natural light if it's available.
So there you have it, even though it might seem a bit spooky, rest assured that red-eyes in photos are completely normal and can be easily prevented.