Because of a bullet wound to the head, Lucas Murdoch suffers from severely impaired vision ("Left eye's gone... right eye ain't much good after sundown"). This becomes a major plot point and is a factor in the final gunfight. But, on the night the outlaws plan to raid the bank, Murdoch reads a map by the light of an oil lamp, and after the shooting stops he easily identifies the bodies of two dead gang members by what little light there would be in the street.