Power. "My Last Duchess<span>" is all about power: the political and social power wielded by the speaker (the Duke) and his attempt to control the domestic sphere (his marriage) in the same way that he rules hi...</span>
The answer would be "It is used positively in the poem, but it usually has a negative connotation."
Explanation:
Blind sight is a contradiction in terms, Like- the old phrase- I see, said the Blind Man