How do blind people who haven't always been visually impaired deal with their day-to-day lives? I've heard rumors (very, very unreliable rumors) that once you stay in the dark for too long you'll start to go insane, but I haven't met one "insane" blind person yet, nor have I ever heard of one.
However, it's proven that low levels of dopamine result in depression, anxiety, etc. And low levels of dopamine just means a lack of production or intake by the dopaminergic receptors. If the lack of happiness results in disorders such as depression, what would a lack of light do?
Also, why do their other senses strengthen? I read a question earlier about how someone trained themselves to write and read upside down, but then had trouble writing b's, p's and q's, apparently this was due to a process called "negative transfer", does this have anything to do with it? Less energy used meaning more available to enlarge the other's capabilities?