The Eye

• What should you be able to do by the end of the video on the eye?

  Name the different parts of the eye and state their functions
• Why is it important to learn the details about the eye?


  Because it is a common exam question
• What is the function of the cornea?


  • Starts the focusing of light rays
  • Transparent front of the eye
• What is the role of the iris in the eye?


  The iris controls the size of the pupil
• What is the function of the lens in the eye?


  • Focuses light rays onto the back of the eye
  • Changes shape to allow focus on distant or near objects (accommodation)
• What is the retina responsible for?


  The retina contains receptor cells for light
• How do receptor cells in the retina send information to the brain?


  They send electrical impulses down the optic nerve
• What is the sclera?


  • The white part of the eye
  • A tough outer structure that protects the eye
• What do the ciliary muscles and suspensory ligaments do?


  • Work with the lens
  • Allow focusing on distant or near objects
• What is the pupil?


  The pupil is the space in the center of the iris
• What happens to the pupil when entering a dark room?


  The pupil becomes larger to allow more light to enter
• How does the brain respond to low light intensity?


  The brain sends electrical impulses to the iris muscles to contract
• What is a reflex action in the context of the eye?


  A reflex action does not involve the conscious part of the brain
• What happens to the pupil when entering a bright room?


  The pupil becomes smaller to reduce light intake
• What will be covered in the next video?

  • How the eye focuses light from distant or near objects
  • Further details on the structure and function of the eye