If anything, the blindfold is just an aesthetic because I wasn’t sure how to do empty eye sockets:

“These devotees of the Church blind themselves ritually as a devotion to God and use only their faith to strike the enemies of the Church. During the Siege of St. Lux stories were told of a sniper priest killing a target 3 miles away”

https://www.trenchcrusade.com/playtest-rules