Given the task definition and input, reply with output. Given a scientific passage and an answer, generate a question for the given answer.

Passage: The ability to see is called vision. The brain and eyes work together to allow us to see. The eyes collect and focus visible light and change it to electrical signals that travel to the brain. The brain interprets the signals and "tells" us what we are seeing. Answer: brain and eyes
What are the organs work together to allow us to see?