Why do ragnars eyes glow?

Why do ragnars eyes glow? It makes sense to me that Ragnar’s eyes color directly reflected his spirit at the time. When he was young, ambitious, the most “viking”, his eyes were extremely bright blue and healthy. As age, weariness, and doubt crept into his psyche, they became grey and less vibrant, more lifeless.

It makes sense to me that Ragnar’s eyes color directly reflected his spirit at the time. When he was young, ambitious, the most “viking”, his eyes were extremely bright blue and healthy. As age, weariness, and doubt crept into his psyche, they became grey and less vibrant, more lifeless.