2007-01-17 01:29:13 · 5 answers · asked by nature 1 in Science & Mathematics ➔ Biology
Thanks Sharonsky for yr answer. I have a photo whereby my friend did not look directly at the camera, but her pupils are red.
2007-01-17 01:37:28 · update #1
Thank you everyone for yr effort in answering. :) God bless!
2007-01-17 01:51:33 · update #2
Yes, it's reflection from the back of the eye. This is why it occurs primarily when a flash photo is taken in subdued lighting - the pupils are dilated and the flash from the camera reflects back. Professionals (and others) use flash that is not aligned with the camera. Some modern small cameras have a setting that gives out a flash burst before the main flash, the aim being to cause contraction of the pupils before the main flash thereby reducing the likelihood of red-eye.
2007-01-17 01:35:03 · answer #1 · answered by JJ 7 · 0⤊ 0⤋
The flash on a camera is bright enough to cause a reflection off of the retina -- what you see is the red color from the blood vessels nourishing the eye.
See the link for lots more info:
2007-01-17 09:41:19 · answer #2 · answered by Gerfried 2 · 0⤊ 0⤋
I recall reading somewhere that it's caused by a reflection off the retina of the eye. The more technical cameras produce a flash that reduces or eliminates this problem.
2007-01-17 09:38:32 · answer #3 · answered by ursaitaliano70 7 · 0⤊ 0⤋
I think it happens when people look directly at the flash.
2007-01-17 09:32:35 · answer #4 · answered by sharbysyd 3 · 0⤊ 0⤋
didnt your grandmother tell you that is how you can tell who is really evil in this world...my grandmother told me and she doesnt fib
2007-01-17 09:38:09 · answer #5 · answered by Anonymous · 0⤊ 0⤋