What use does Salman Rushdie make of the theme of "sight" in the story "Good Advice is Rarer Than Rubies?"

The idea of sight is an interesting theme that comes out
of the short story.  In the mere setting, there is a clouding of dust outside the
consulate/ embassy, making it difficult to see.  At the same time, the amount of
forgeries and individuals posing as governmental sanctioned people who can authorize
passports and visas make it difficult to "see" who is legitimate and who is not. 
Muhammad Ali is one of these individuals who attempt to make it difficult for the
"Tuesday women" to see him for being the conman he is.  At the same time, Ali could not
see how Miss Rehama was acting in a fraudulent manner, in that she did not want to go to
England and rather stay at home.  He could not see that her vision was more clear than
his.  The lack of clarity in sight is part of the theme of duplicity that is present in
the short story.  Ali is not who he purports to be, Miss Rehana is not who she claims to
be, and the sight that is present is obscured by personal agendas.  In the end, no one
is able to "see" anyone for who they are, as this masquerade makes sight
impossible:

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No one in this story is reliable in
actions or character, making how we know the truth of anything another theme. This
deconstruction of a final, clear truth is an aspect of Rushdie’s postmodern view of the
world. Whom can we trust? How do we know someone speaks the truth?... Muhammad Ali makes
it his profession to dupe the same Tuesday women, eliciting money from them for imagined
services. Miss Rehana is perhaps the least reliable of characters, for she acts one way
while she thinks another, so that neither Muhammad Ali nor the audience know her
intentions until the end of the
story.

It is this
lack of clarity that makes sight an extremely important theme in the short
story.