Good observation on your part.
I think you're telling the truth because I haven't got the episodes with me at the moment to check out myself.
But I think that Ur probably right
I think Kakashi did do research too.He knew that the mangekyo sharingan of Itachi is causing blindness.
I don't think Kakashi is going blind.Remember that eternal ms is gained through the change of hosts.My theory is that since Kakashi is not the original owner of the sharingan,the blinding...