here, this is
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. We know oro left akatsuki after his humiliating defeat against Itachi. That was 7 years ago and itachi, by DB stats, was 17-18 during the time of that previous scan. That means he defeated oro at roughly 11 years old.... Yet it's also said he joined akatsuki after assassinating his clan, which he did at 14+...
So, obito's chakra travels over 20 feet from his brain to his eye. Hey, crazier things have happened in this series, so why not.
Think FFS, that's why you're going to school.... How the hell will something crush your skull yet leave your eye undamaged? His face was even scarred to show that it was damaged(but in an attempt for kishi to not have to make up a BS excuse about how his functioning with half his head gone). Obito's right half was destroyed so badly that it was
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, but you're trying to believe an eye can survive that damage.