Comes in seeing - leaves able to see

Hi. I'm translating an article by Lewis Opler about Schizophrenia into Spanish and I have a couple of doubts. This is the whole sentence:

"A common metaphor for successful cognitive-behavioural therapy is that the patient comes in seeing the glass "half empty" and leaves to see that even "half-empty" glasses are simultaneously "half full"

Comes to see: ¿ve?
Leaves to se: ¿Deja de ver? ¿No ve?

How would you translate those phrases?

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