this is what Neji says about Shino "A clan whose members, at birth, give there bodies to insects to use as nests. The clan can freely conrtol the insects, and use them as their primary fighting technique... In exchange, they feed them with chakra, establishing a contract with the bugs.." anyway bk to my point he must have eyes as he was born just like any normal person, and his body was not just made entirely out of bugs he just had bugs living inside of him.