The eye

• What is the eye classified as?

  A sense organ
• What do the receptors in the eye detect?

  Light intensity and color
• What is the transparent front part of the eye called?

  The cornea
• What is the function of the cornea?

  To start focusing light rays
• Where do light rays pass after the cornea?

  Through the pupil
• What is the iris?

  The colored part of the eye
• What is the function of the lens?

  To focus light rays onto the retina
• What is accommodation in the context of the eye?

  Changing lens shape to focus
• What is the back part of the eye called?

  The retina
• What do the receptor cells in the retina detect?

  Light intensity and color
• What do the receptor cells in the retina send to the brain?

  Electrical impulses
• What is the white part of the eye called?

  The sclera
• What is the function of the sclera?

  To protect the eye
• What do the ciliary muscles and suspensory ligaments do?

  Help focus on distant or near objects
• What is the space in the center of the iris called?

  The pupil
• What is the role of the iris?

  To control the size of the pupil
• What happens when you enter a dark room?

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

  Sends impulses to iris muscles
• What is a reflex action in the context of the pupil?

  It does not involve conscious brain
• What happens when you walk into a bright room?

  The pupil becomes smaller
• Why does the pupil become smaller in bright light?

  To reduce light entering the eye
• What are the main parts of the eye and their functions?

  • Cornea: Starts focusing light
  • Iris: Controls pupil size
  • Pupil: Allows light entry
  • Lens: Focuses light onto retina
  • Retina: Contains light receptors
  • Sclera: Protects the eye
  • Ciliary muscles: Adjust focus
• How does the eye adapt to dim light?

  1. Light intensity drops
  2. Retina receptors send impulses to brain
  3. Brain sends impulses to iris muscles
  4. Iris muscles contract
  5. Pupil enlarges to allow more light
• How does the eye adapt to bright light?

  1. Light intensity increases
  2. Retina receptors send impulses to brain
  3. Brain sends impulses to iris muscles
  4. Iris muscles contract
  5. Pupil constricts to reduce light