I haven't read this yet but what you said remind of an anime with a concept of diff fake bodies and when they transfer to brain to the other, but the eyes are connected to the brain so they too get connected. Like I said I haven't read it but it would be cool to think there might be a reason as well
I love this a lot because there's a saying that the eyes are the window of one's soul
You're right ( I finished reading this now) it definitely seems like in this case the eyes reflect their souls and that's a nice concept
Just realized i used the wrong their*
I love how they're eye colour exchanged when they switched bodies.