I think anyone who denies a supernatural component at this point is grasping pretty hard at straws, so in that context, why try and explain Mei's eye scientifically? It's a magic eye. It may not make sense from a medical standpoint, but there's a certain suspension of disbelief in the premise to begin with. And this ability of her eye to see things supernaturally has already been discussed much earlier in the series, so I don't think anyone should be shocked to hear it now.
Alternatively, Mei could have some reality issues and the whole business with her eye could be a figment of her imagination. It's possible.
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