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Why do cats and dogs eyes glow in the dark?

Published Friday, May 18, 2007 by R. Edmondson | E-mail this post

Cats and dogs eyes glow at night because of a silver “mirrors” in the back of their eyes called the tapetum lucidum (meaning "bright carpet") which is a thick reflective membrane. This collects and re-emits light back to the retina a second time thus giving the light-sensitive cell (rods) a second opportunity to absorb the image information again. This a adaptation for night vision and makes it easier for them to see at night by maximizing the limited available light. Hence, the reflected light from the tapetum let the animal's eyes appear to glow in the dark.

Labels: Animals, Biology

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I'm R. Edmondson
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