Why cats and dogs are not supposed to have red eye in the pictures?

Question

I'm studding to be a photographer and my teacher say that cats and dogs are not supposed to have red eyes in the pictures when you use flash,he doesn't know why.It someone know why?

Answer 1

The reason that cats and dogs and people have red eye

is because you are focusing directly into iris of their eye and

what you are seeing is the blood at the back of their eyes.

To avoid this problem don't shoot directly in their faces with the flash either hold your camera to the side so you are pointing at the side of their eyeball and not directly into the iris or else get the animal to look away from the camera.

Answer 2

cats espescially have not red but green eye,i've seen it.it's there tapena(sp?)it helps them see in the dark(cats are naturally nocturnal)all animals with eyes have a tapena...dogs do get red eye...red means the creature is a daytime dweller, geen means they are nocturnal..

so i dunno it may be because their eyes are shaped different so it's harder for the flash to catch their tapena.

Answer 3

"Red eye"  occurs when someone looks directly at the camera while a picture is taken. If the flash is on the same axis as the visual axis of the camera, the reflection off the blood vessels in the person's retina can produce an eerie, satanic look, the so-called red reflex.

Dogs, cats and almost all domestic animals have a special reflective layer in the back of the eye termed the tapetum. Incoming light passes through the animal's retina and is then reflected back through the retina a second time from the tapetal layer. This double stimulation helps these species to see better in dim light. The color of this tapetal layer varies to some extent with an animal's coat color. A black Labrador retriever, for example, will usually have a green tapetal reflection. A buff-colored cocker spaniel will generally show a yellow, tapetal reflection. Most young puppies and kittens have a blue tapetal reflection until the structures in the back of the eye fully mature at six to eight months of age. "Color dilute" dogs and cats, such as red Siberian huskies and blue point Siamese cats, may have no tapetal pigment and may therefore exhibit a red reflex just like human beings.

Answer 4

Maybe,when you use the flash,the light make their eyes red...

Answer 5

The tapetum lucidum (Latin: "bright tapestry", plural tapeta lucida)[1] is a layer of tissue in the eye of many vertebrate animals, that lies immediately behind or sometimes within the retina. It reflects visible light back through the retina, increasing the light available to the photoreceptors. This improves vision in low-light conditions, but can cause the perceived image to be blurry from the interference of the reflected light.[citation needed] The tapetum lucidum contributes to the superior night vision of some animals. Many of these animals are nocturnal, especially carnivores that hunt at night, and their prey. Others are deep sea animals. Although some primates have a tapetum lucidum, humans do not.

Eyeshine



In darkness, eyeshine reveals this raccoonEyeshine is a visible effect of the tapetum lucidum. When a light is shined into the eye of an animal having a tapetum lucidum, the pupil appears to glow. Eyeshine can be seen in many animals, in nature and in flash photographs. In low light, a hand-held flashlight is sufficient to produce eyeshine that is highly visible to humans (despite our inferior night vision); this technique, spotlighting, is used by naturalists and hunters to search for animals at night. Eyeshine occurs in a wide variety of colors including blue, green, yellow, pink and red. However, because eyeshine is a form of iridescence, the color varies slightly with the angle at which it is seen and the color of the source light.

The human eye has no tapetum lucidum, hence no eyeshine. However, in humans and animals two effects can occur that may resemble eyeshine: leukocoria (white shine) and red-eye effect (red shine).

[edit] Blue-eyed cats and dogs

Cats and dogs with blue eyes (see Eye color) may display both eyeshine and red-eye effect. Both species have a tapetum lucidum, so their pupils may display eyeshine. In flash color photographs, however, individuals with blue eyes may also display a distinctive red eyeshine. Individuals with heterochromia may display red eyeshine in the blue eye and "normal" yellow / green / blue eyeshine in the other eye. The red-eye effect is independent of the eyeshine: in some photographs of individuals with a tapetum lucidum and heterochromia, the eyeshine is dim yet the pupil of the blue eye still appears red.

Answer 6

Cats and dogs usually DO have red eye in photos due to a special layer in their eyes called a tapetum lucidum, which captures available light and reflects it back.  This is why cats and dogs have better night vision than humans.

http://en.wikipedia.org/wiki/Tapetum_luc...

Answer 7

They have a mirror thing in the back of their eyes.

Answer 8

I know dogs can see in black and white only. Their eyes lack something which enables them to see colour.