2007-01-08 04:29:28 · 15 answers · asked by Solo 1 in Science & Mathematics ➔ Biology
Red eye is caused by the illumination of the retina (blood-rich back of inside of the eyeball) by flash. This is intensified by the lense of the eye. Although the pupil appears black in everyday light, it is actually a hole in the iris (colored disk that denotes eye color) that only *appears* black because there is much less light inside the eye than in ambient light.
2007-01-08 04:31:08 · answer #1 · answered by Jerry P 6 · 2⤊ 1⤋
It's a problem which is made worse with compact cameras, where the flash gun is physically close to the lens. This means that the area of the retina illuminated by the flash is the same area which is being photographed through the camera's lens. If the flash gun is some distance from the camera's lens, the bit of the retina being photographed is not the same bit that the flash is lighting up, so it shows black. Some compact cameras let off a few mini-flashes before the main exposure. The idea is to minimize the red eye by causing a reflex action in the iris of the subject's eye which makes the pupil smaller before the picture is taken
2016-05-23 10:45:30 · answer #2 · answered by Anonymous · 0⤊ 0⤋
It is caused by light reflecting off the retina and is very common and varies by person rather than by camera.
The Google download of Picassa has an excellent red eye removal tool.
2007-01-08 04:31:25 · answer #3 · answered by Anonymous · 0⤊ 0⤋
you know when you are driving down the road and see an animal on the side and how their eyes seem to glow well its the light bouncing off the back of the eye ball and in pictures the flash can do the same thing as your head lights do to the animals
2007-01-08 04:32:06 · answer #4 · answered by prettygirl_80650 3 · 0⤊ 0⤋
Reflection of the eye pigments of cones inside the eye from the flash.
2007-01-08 04:32:07 · answer #5 · answered by Sammyleggs222 6 · 0⤊ 0⤋
Photographing evil red eyed demons.. could be a cause
2007-01-08 04:31:31 · answer #6 · answered by Spooky Mouse 5 · 0⤊ 0⤋
What you see is the red color from the blood vessels nourishing the eye.
2007-01-08 04:32:13 · answer #7 · answered by asedwards21 2 · 0⤊ 0⤋
The flash reflecting off the back of the eyeball.
2007-01-08 04:31:05 · answer #8 · answered by nhanceddans 1 · 0⤊ 1⤋
a bug that they dont' know how to fix . I mean maybe they havne't figured out an algorithm to handle some reflective color
2007-01-08 04:30:39 · answer #9 · answered by Anonymous · 0⤊ 0⤋
The reflection of the liquid (vitreous fluid) in your eyeball.
2007-01-08 04:32:28 · answer #10 · answered by Anonymous · 0⤊ 0⤋