So, I was doing some research, and it turns out that it is in fact possible to get facial paralysis from sudden cold temperatures. So my theory that Sero’s eye is messed up from the sports festival has some credibility now, hell yeah.
Bell’s Palsy is a rare condition with a undetermined main cause, it’s suspected to be caused by a viral infection of sorts, that causes temporary, in rare cases permanent, facial paralysis. It typically heals within a few weeks, and has a complete recovery in about 6 months, though there are people who continue to experience Bell’s Palsy throughout their entire life. If it isn’t treated quickly after discovery, it can have long lasting, possibly permanent affects. This may be why Sero still shows signs of Bell’s Palsy long after the sports festival.
Here’s where the cold come in. It was discovered in 2018 that being exposed to sudden cold temperatures after being in hot temperatures can bring on Bell’s Palsy or at least some kind of nerve damage, which leads to the paralysis of facial muscles. The sports festival took place during a relatively warm time of year (summer going into fall is my assumption based on the timeline), and the iceberg was extremely sudden, unexpected cold, could very likely lead to facial paralysis.
The paralysis of the facial muscles often makes it so you’re unable to properly close an eye, leading to your eye not getting the moisture it needs and getting dry, possibly explaining the lines around Sero’s eyes in chapter 320, and judging by the fact that the lines are by his eyes in two panels, I’m gonna assume its on purpose and not an artistic error for now. Bell’s Palsy is also the only medical explanation for the droop in Sero’s left eye that I can think of.
But hey, it’s just my theory. Maybe I’m looking into things a little too deep, who cares, its still fun to theorize about mundane stuff like this.
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