Star Wars: Old Republic - Power of the Darkside
GH-7T is a modified meddroid. He is called “Patch” for two reasons: he patches up the crew when they need it and for some unknown reason he has a short in the wiring of his left optic sensor housing that causes all replacement sensors to burn out in a matter of days. His visual deficiency does not hinder his performance, so Da’Naer stopped paying to have the sensors replaced.
As a joke, Ji Ton purchased a bantha hide patch and placed it over GH-7T’s burned out “eye”, adding to his nickname.