Boy, you learned it in your youth

The basic premise is this:

After the events of season 2, Stiles feels that he needs to do more with regards to his friends and the supernatural side of things in Beacon Hills. He chooses to become an apprentice of sorts under Deaton.

Things go well, until a spell backfires and he injures his eyes. He's not permanently blinded, but he won't ever have 20/20 vision again.

Below is the ramblely, TL;DR version.
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