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Why does yellow or green eye Occur on dogs when you use a flash on a camera?
Wiki User
∙ 14y ago
For humans, when you flash the cam, red eye occurs. That's because the flash passes through the eye and is reflected off the retina and the blood vessels of retina impart the red colour to the out coming reflected light.
More detailed: You see an object when light reflects off it. The colour of the object is the colour not absorbed by it from the incident light. Blood is red because it does not absorb red colour. When you send heavy light in the form of a flash, a large magnitude of red colour goes unabsorbed and the eyes' reflected light's red component becomes significant which is noted as red eye. If there is no flash, the atmospheric light getting reflected off the retinal blood vessels is not intense enough forthe red component to be distinguishable from the other lights.
Similarly, dogs and cats have a tapetal layer in addition to retina. And this tapetal layer is of green or yellow colour depending on the animal species. The flash passes through the tapetal and retinal layer. The colour of the tapetal layer is imparted on the reflected light.
Wiki User
∙ 14y ago
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