tbh I’ve always kinda thought that the whole thing with Kaz’s eyes is that he got some benign form of the parasites that allows him to see in infrared. That’s why he can totally see Quiet when she’s shadestepping but he’s obviously not telling anyone about it because of the stigma on parasites. 😦
And while he can also see normally, extreme light hurts him and gives him migraines. But yeah he’s totally rockin’ that Predator-vision.