Are there actually contact lenses that look like this, or is it an editing trick? I think they'd be great for a Batman cosplay.

yes they exist, they're called sclera lenses
https://www.sclera-lenses.com/product/sclera/white-zombie-sclera-contact-lenses-_1-pa/358

note: they may be uncomfortable to wear because they cover nearly your whole eye, and you also won't be able to see that well with them in, too

>>10954587
Ah they're more intense than normal colored contacts? That's too bad, but thank you! Maybe I'll try them out

Sclera lenses are huge and cover your whole visible eyeball, and are generally uncomfortable and also hazardous to your eye health for long-term wear. But I've had lenses called "mini-sclera" that have this effect. The "mini-sclera" are basically circle lense sized, to cover the whole Iris, so waaay more comfortable and wearable, though still restrictive to eyesight. Mine also were not white-out but rather black, with a tiny pinhole for my pupils. Eyesight was mostly normal in good lighting, but in the dark pretty bad.