The eyes bud out from the brain during development, and usually when something like this goes wrong with the eyes there are brain anomalies as well. I would not be surprised if he displayed abnormal behavior because of it. So it's not just an issue of him being blind, but the rest of his brain and nervous system possibly being affected as well. I'm not saying you have to put him down but be prepared that he may not live more than a few days naturally, poor guy.