I think he actually did wear glasses to see. I remember him wearing them in the video where he was working for the school production. And those style frames were normal/popular back then. I doubt the sunglasses had a prescription in them though. I guess it is always possible though.
I remember reading that he spent a lot of money for those sunglasses and was really upset when he broke them.
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"I’ll see you in Heaven if you make the list"
Zachary Patrick Bowen (March 7, 1995-November 5, 2021).
I miss you little brother.