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What causes one pupil to be red in photographs and the other pupil to remain black?
The red-eye effect in Photography is the common appearance of red pupils in color photographs of eyes. It occurs when using a photographic flash very close to the camera lens (as with most compact cameras), in ambient low light. Red-eye effect appears in the eyes of humans and animals that have no tapetum lucidum, hence no eyeshine, and rarely in animals that have a tapetum lucidum. The red-eye effect is a photographic effect, not seen in nature.
Because the light of the flash occurs too fast for the pupil to close, much of the very bright light from the flash passes into the eye through the pupil, reflects off the fundus at the back of the eyeball, and out through the pupil. The camera records this reflected light. The fact that the reflected light is red often is attributed to the ample blood supply of the retina and/or chorium, but this is incorrect. The red-eye effect is due to the color of the fundus, which is due to melanin, a pigment, principally located in the retinal pigment epithelium (RPE).
Although in many animals the RPE is black, in humans it is brown. Red-eye effect is more pronounced in people and animals with lighter colored eyes, especially grey or blue eyes, and in children. In both groups, all tissues of the eye have relatively less melanin. In a pale eye, and in a child's eye, not only does the iris have less melanin to stop stray light from passing through it, but also the retina and choroid have less melanin to absorb stray light that enters the eye. The role of melanin in red-eye effect is most clearly seen in animals with heterochromia: only the blue eye displays the effect. The effect is still more pronounced in humans and animals with albinism. All forms of albinism involve abnormal production and/or deposition of melanin. Red-eye effect is seen in photographs of children also because children's eyes have more rapid dark adaption: in low light a child's pupils enlarge sooner, and an enlarged pupil accentuates the red-eye effect. More information on the related link below.
What else can I help you with?
What is a place where photographs are taken called?
Photographs are taken in a lot of places, but often professional photos are taken in a photography studio.
Can the state constitutionally force Muslim women to remove their scarfs and other head coverings for their drivers' license photographs?
It depends on the specific state law.
What is the art of the depression?
The most associated art with the great depression are the photographs of Dorthea Lange. She and many other artists found work through the WPA projects offered by the government.
All information data text software music sound clips photographs graphics video messages or other materials are the sole responsibility of?
the cop knowledge owner, the person posting them
How do they take the pictures for Google Earth?
The satellite that revolves around the earth.AdditionallyStreet View photographs on the other hand are taken by Google or its associates typically by cars with special cameras.
Why is black warmer in the sun than other colors?
Black absorbs more light energy from the sun compared to other colors, which causes it to heat up more quickly. The absorbed light energy is converted into heat, raising the temperature of the object. In contrast, lighter colors reflect more light, so they do not absorb as much energy and remain cooler.
What is black blood caused from?
Can be caused from there being a lack of Oxygen in the blood, but there can be other causes... if you have black blood see a doctor
Can the black mold that causes cancer and other diseases appear in washing machines?
Yes
Should photographs be censored?
No. on the other hand there is age appropriateness
What are some causes of black stools?
Black stool is a condition where the feces are very dark and nearly black. Sometimes this is caused by supplements. Other times it is indicative of internal bleeding.
Who said that there were other galaxies?
Astronomers, looking at deep space photographs of the Universe.
What causes black sperm?
there could be a bleed in the seminal tubes though the sperm of other mammals can range from white to gray
List four causes that led to the Renaissance?
Two of the four causes that led to the Renaissance are the black plague and the press. The other two causes that led to the Renaissance includes the changes in climate and the new trade routes taken by the crusades.
Is black hair dye any worse on your hair than other colors?
no it's not, bleaching it probably causes the most damage
How people smoking causes pollution?
smoking mainly causes pollution inside of the person. specifically in the lungs. the lungs turn black and get polluted. this makes it harder for the smoker to breathe. this causes other health problems too! what ever you do, DO NOT SMOKE!
How does the earth the stay in space?
Both the Sun and the Earth exert gravitational pull on each other; the resulting tension causes the Earth to remain in space rather than crash into the Sun.
What are the possible causes and treatments for a black spot in my dog's eye?
Possible causes of a black spot in your dog's eye could include cataracts, glaucoma, or a tumor. Treatment options may include surgery, medication, or other interventions depending on the underlying cause diagnosed by a veterinarian.
