This is a common Spanish saying that highlights the absurdity of a blind person saying "I see". It's often used to express:
* Sarcasm: When someone says something obviously untrue or ridiculous.
* Irony: When someone pretends to understand something they clearly don't.
* Skepticism: To express disbelief or doubt about something.
The closest equivalent in English would be something like "Yeah, right," or "Sure, I believe that."