Take one helmet; mount eye-facing UV LEDs in rim; insert UV-reacting contacts, voila!
Caution: shining UV lights into your eyes for extended times will seriously injure you.
The helmet is the work of Kiwi cosplayer Kyle Simpson, who warns: "If you wear this for an extended period of time—for example you go to a convention for three days and you have it pumping the whole time—you're probably going to have problems. So just be responsible and stay safe."
This Cosplayer Made a Helmet That Makes Your Eyes Glow Like Thor [Kaleigh Rogers/Motherboard]
