Green’s Dictionary of Slang

glick n.

[Scots glaik, a flash of light, Irish gleek, n. a peep, v. to stare aggressively]

(US) a glass eye.

1900

Nat. Police Gaz. (NY) 10 Mar. 11/3: He’s liable to pull that ‘fake glick’ put of its socket and sport it around town for a breast-pin.