The one enormous eye of the strawberry squid brightly glows under blue light. MBARI The researchers think the squid uses this big eye to better spot the silhouettes of prey above it.

Mr. Blue Eyes, named for his perpetually glowing blue eyes, is a shadowy and mysterious character, and it's entirely possible to finish the game without even encountering him.

Garry, the Street Prophet, rants about all manner of conspiracies, but in a seeming moment of clarity, describes Mr. Blue Eyes to a tee with his suit and glowing blue eyes. In Cyberpunk ...

The eyes of an Arctic reindeer also do this, but because of the seasonal physical changes to the tapetum lucidum, the wintry blue eyes reflect 50 percent less light than the golden eyes of summer ...

There's also a moment, during a crowd scene at Olympus, where a few of the zombies in the crowd also appear to have the same glowing blue eyes, indicating that they, too, are robots, not real zombies.

The researchers note that the blue tapetum also allows up to 60 percent of ultraviolet light to enter the eye, meaning reindeer see their surroundings in winter in shades of purple with surfaces ...

The kitefin shark is a guitar-sized creature with brownish-black skin and large, gaping eyes. But there is more to this shark than initially meets the eye: in the dark, it will emit a blue glow.