Consider the motif of seeing/sight. How does 'seeing clearly' or 'seeing the truth' help certain characters advance? How does metaphorical blindness cause problesms for certain characters (particularly the men)? How is self-perception instrumental?
Perhaps the title of Hurston's book suggests that the vision which Janie needs is one of the soul rather than one of body. For, it is in the development of her interiority, her inner voice and consciousness, that Janie becomes a whole person, released from the domination of the men in her life. With the aid of Tea Cake, Janie finds her own voice; thus, she becomes her own person, no longer having to cover her luxurious hair, no longer suppressed in her feelings.
I would want to argue that there are various moments of this novel when Janie in particular sees her life for what it is and also sees her various husbands for who they are. Blindness or lack of self-perception is key in both of her first two marriages, as both of her husbands display a lack of self-perception that shows they are unable to see themselves in the way that Janie comes to see them. Also, let us remember that Janie achieves a moment of self-perception at the very end of the novel when she is able to look back on all of her experiences and gather them in like a shawl.