1- Yes, there is a difference, but not an especially significant one. Both help with vision or with walking. The difference is that they are more technologically advanced than glasses or an artificial hip.
2-Benefits include making life easier for those who have disabilites. A risk is that these devices malfunction and harm the person using them, or stop working at a critical time. Also, we may come to rely on them too much, and not be able to function with out them.
3- Yes, I think the development of advanced bionic devices is inevitable, and no doubt, decades or millineums from now, they will be as mainstream as laptops and cell phones are today.
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