Question 1: 4. What is the main purpose of this passage?

• To persuade the reader to pay close attention to blind spots.
• To explain the way visual perception works. (Correct answer)
• To persuade the reader to consult an optometrist if the O and X disappear.
• To prove that vision is a passive process.

Correct answer: To explain the way visual perception works.

If the main purpose of a passage is 'to explain the way visual perception works,' the author would detail the processes, mechanisms, and components involved in how humans see and interpret visual information. This would involve describing the anatomy of the eye, the brain's role, and perhaps common phenomena like blind spots, all with the goal of clarifying the complex process of vision. It aims to provide a comprehensive understanding of the topic.