2006-10-24 05:43:17 · 4 answers · asked by malounicart 1 in Science & Mathematics ➔ Other - Science
Because the light from the camera flash refelcts off of the blood in the cells of the retina at the back of our eyes.
2006-10-24 05:51:06 · answer #1 · answered by Anonymous · 0⤊ 0⤋
To add to the information you have already received, this "red eye" only occurs when the reflected light goes in and refects out of the eye at the same angle.
If you see professional photogs work, you may not that they either use lights and screens way off to the side, or the flash attachement to their cameras is set to one side or another of the camera lens. The light reaches the eye at an angle, and the red reflection goes off to one side of the lens, instead of directly in.
Some cameras have a "red eye" setting used to minimize this effect. This works by flashing a second, or so before the real picture and flash is taken. The first flash will narrow the pupil of the eye, making the red eye reflection more difficult to reach the camera lens.
2006-10-24 07:18:57 · answer #2 · answered by Vince M 7 · 0⤊ 0⤋
If the eye is looking directly at the camera lens (and adjacent flashbulb) the flash (photons) will enter the eye and be focused by the eye's lens on the entire retina. The retina will absorb all photons except those with a wavelength equal to red (the color of blood) which will then reflect back through the lens of the eye focused on the camera. If the eye is looking away from the camera it will not look red because very little light is reflected back.
2006-10-24 06:11:13 · answer #3 · answered by Kes 7 · 0⤊ 0⤋
The light is reflecting off the blood vessels in the back of our eye.
Animal eyes show other colors, such as green because they have a special light-reflecting membrane that helps them to see better at night.
2006-10-24 05:51:43 · answer #4 · answered by Suedoenimm 3 · 0⤊ 0⤋