Yes, there are numerous species, that live in a wide variety of environments that live in complete darkness. There are bottom of the ocean dwellers and scavengers who never see light. There are also animals that live in caves that never see, some of which have lost their eyes due to their lack of light to make them useful.
Yes. As tool has already mentioned, many cave dwelling animals survive without the use of eyes. If you watch the “Caves” portion of the Planet Earth series, you can see many of these animals in action. For example, within cave systems are animals like salamanders, fish, and crabs that survive without the help of eyes. Through the process of evolution these animals simply lost the eyes because in the dark areas of caves there is no use for them.
Texas blind salamander
Photo Credit: http://commons.wikimedia.org/wiki/File:Texas_blind_salamander.jpg
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