How does the vision imagery relate to the theme of invisibility?

Really vision/blindness/invisibility are motifs which the author uses to get his themes and story across. Blindness is a way that people avoid seeing or confronting the truth. To people who are wilfully blind, certain other people become invisible to them. Also vision or rather lack of vision allows people to exploit others. Take for example the “battle royal” wear blindfolds are worn when fighting. This symbolizes the fact that these boys do not see the fact that they are being exploited by white men.