Why do sometime eyes appear red in photograph?
966162
The flash is the problem. The eye's retina contains a crisscross of red blood vessels. Sometimes, when the light from a camera flash reflects off the retina it bounces back to the camera lens carrying a red tint from the blood vessels and from a brownish pigment in a few layers of the retina.
465473
Yes it is possible but it is time consuming. Basically, you need to create a new layer and try to work with the same color that the surrounding eye is. Then adjust the transparency until it matches closely and doesn't look odd at 100%.\n\nOn the other hand, if you download Picasa from Google, there is a red-eye tool and it works very well.
1019866
A digital camera is sensitive to a different spectrum that the human eye.  So naturally it is sensitive to frequencies below red, and above violet (this is also somewhat true of some types of film).  That is why a digital camera can photograph the flashes of light coming from a TV remote.\n\nBoth digital cameras and emulsion types, can capture very fast events when using high shutter speed.  Your eyes are just not that quick, and are not really designed to capture fast events.\n\nEmulsion type cameras, and to some extent digital cameras, can see very faint objects because they can collect light over long exposure times.  \n\nAlso everything you see is processed though your brain.  Your brain is very subjective.  So what you see is somewhat affected by your experiences, attention span, and your personality.  A camera has no such issues.
136451
Maybe the original picture file is corrupt.
960638
I've never experienced a phenomenon that could not be related to some outside perturbation\n\nAs for the human retina, it has about 125 million rod photoreceptor cells (plus about 6 million cone cells, used mostly at night).  On a surface roughly 1/4th of that of a full format digital SLR today, the retina has about 10x more "pixels", i.e. a density 40x higher (and our own "pixels" don't interfere w eachother, unlike those of cameras ;-)\n\nGiven that from even as low as 10 megapixels is is pretty much impossible to see any on a postcard size print, I'd be very surprised if anyone could identify individual megapixels in the case of our own 125 megapixel camera ;-)\n\nhope this helps\n\na
586747
they are called phosphenes.\nit's caused by mechanical stimulation of the photoreceptors in your retina.
239842
yes multiple sclerosis can cause red/green color distortion to arise spontaneously
349193
Any exertion that would cause you to be red in the face.  Somethimes the blood vessels are weak and they can just snap.  It is rarely anything to worry about, but you should see a doctor just in case.
609119
The image is focused in front of retina, and you are near-sighted (MYOPIA).
1134599
It's light bouncing off the back of the inside of the eye. The camera catches it before the iris has time to contract in response to the higher light level. I've seen the red eye effect firsthand, in real time. A cousins baby was staring up at a streetlamp, quite creepy. Animals have a reflective membrane, the 'tapetum lupidia' behind their photoreceptor cells that bounces light back through them, the photo receptors that is, it gives them better night vision by giving the light two chances to hit. We don't have one because our color vision comes with the cost of poor sensitivity in low light.
67626
To "see red" is to become very angry or enraged.\n\nI think it's related to a bull seeing a red flag (as in a bull fight), and charging it.
672737
Must be the perspective. They should actually look smaller (further away) because of the extra distance the light travels from the muscles to the mirror to your eyes.
853151
it's pressure and blood flow...  this sensation of course you know soon fades...\n\nthe optical nerve fills with blood while you are pressing on it and that's what it looks like.. normally the blood circulation looks like swirling clouds in your eyes when the lids are shut.\n\n:D
49214
When you feel certain emotions (like embarassment), then your body reacts by releasing chemicals that cause stuff in your body to happen. When you become embarrassed, the empty blood vessels in your cheeks get filled up with blood. This causes your face to get red.\n\n(The reason your body does this is because it associates certain emotions with feeling cold, so it pumps more warm blood to warm you up.)
652300
When light falls on an apple, all colors are absorbed except for red, which is reflected and picked up by our eyes.  This makes the apple appear red.
162299
It´s because your eye doesn´t receive light in a continuos way. Our eyes are "taking pictures" several times a second, and we have the perception of movement. When a wheel turns fast, suddenly the speed sinchronizes with your eye so first it looks as it is stopping, then it goes backwards, and then again seems to turn forwards.\nThis happens when the speed is changing.
712893
haha I guess for the same reason why most red heads have freckles! who knows? LOL