The eye

• What does light do when it passes through the pupil?

  It refracts and focuses on the retina
• How does the iris respond to bright light?

  The iris constricts the size of the pupil
• What happens to the pupil in dim light?

  The pupil dilates to allow more light in
• What is the role of the retina in vision?

  It receives and processes light images
• What type of image does the retina show?

  An inverted image of the object
• What does the optic nerve do?

  It transmits visual information to the brain
• How does the brain process the image from the retina?

  It turns the inverted image the right way
• What is accommodation in the eye?

  • Changing the shape of the lens
  • Focuses light on the retina
  • Involves ciliary muscles and suspensory ligaments
• What happens to the ciliary muscles when focusing on a distant object?

  The ciliary muscles relax
• What is the state of the suspensory ligaments when focusing on a distant object?

  They contract to keep the lens thin
• What is the shape of the lens when focusing on a distant object?

  The lens is thin and flat
• What happens to the ciliary muscles when focusing on a close object?

  The ciliary muscles contract
• What is the state of the suspensory ligaments when focusing on a close object?

  They relax to make the lens thick
• What is the shape of the lens when focusing on a close object?

  The lens is thick and round
• Why must light rays converge at one point on the retina?

  To see a clear image
• What are the key components involved in accommodation?

  • Ciliary muscles
  • Suspensory ligaments
  • Lens shape changes