I’m working on a story, which includes a minor nation incorporated into a global federation/state. Said minority has impaired eyesight and relies on artificial devices in daily routine. There are no other significant differences between the minority and common people. I need a tag or a slang label to strap on them, so readers can make a connection between the nickname and difficulties with sight. In most cases, this stamp will be used as an offense. Setting: retro future feeling, pseudo Victorian style 1880-1910. So far I came up with: Bat, like in blind as a bat. I don’t know if makes the link strong and obvious enough though. Mole, which has an underground vibe to it. Not fitting. Thanks for your help.