What is the metaphorical value of Brother Jack's glass eye

The attack on Jack reveals his distorted vision when his glass eye falls out of the socket. We have followed the significance of sight and blindness during the novel. Likewise, Jack's eye does not reveal itself as artificial until Jack is fully revealed as such himself. By making him partially blind, an injury he claims he took for the Brotherhood, Ellison implies that the Brotherhood too works as a blinding device.