How does Thomas Middleton use imagery in The Changeling?

There are many images of eyes and references to sight, many of which are used with unconscious irony by Beatrice, who points out that the eye can deceive when it comes to reaching reliable judgments about love and character.

Our eyes are sentinels unto our judgements,

And should give certain judgement what they see;

But they are rash sometimes, and tell us wonders Of common things,

which when our judgments find,

They can then check the eyes, and call them blind.