The Eye

• What are the suspensory ligaments?

  A series of fibers that connect the ciliary body of the eye with the lens, holding it in place
• Where and what is the retina?

  Part of the eye that is at the back:

  -senses light

  -creates impulses that are sent through the optic nerve to the brain
• What is the optic nerve?


  A nerve that carries signals from your eye to the brain
• What are the ciliary muscles?

  Small muscles in the eye that change the shape of the lens
• What does the sclera of the eye do?

  -The white outer layer of the eye

  -Protects the eye and helps keep its shape

  -Connects to the muscles that move the eye
• What does the cornea of the eye do?

  Protects the eye’s surface and focuses light rays
• What does the iris of the eye do?

  Regulates the amount of light entering the eye
• What is the function of the iris in the eye?

  The iris controls the amount of light that enters the eye.
• How do light rays interact with the cornea?

  The rays of light are refracted by the cornea.
• What is the role of the lens in the eye?

  The lens focuses light onto the retina.
• What happens to light rays when they converge on the retina?

  They produce a clear image on the retina.
• What type of cells are found on the retina?

  The retina contains light-sensitive receptor cells.
• What do the light-sensitive receptor cells on the retina do?

  They cause nerve impulses to pass along sensory neurones in the optic nerve to the brain.
• What is the optic nerve's function?

  The optic nerve transmits nerve impulses to the brain.
• What type of sensitivity do some receptor cells in the retina have?

  Some receptor cells are sensitive to colour.
• What is the process of light entering the eye and forming an image?

  1. Light enters through the iris, which controls the amount of light.
  2. Light rays are refracted by the cornea.
  3. The lens focuses the light onto the retina.
  4. Light rays converge to produce a clear image on the retina.
  5. Light-sensitive receptor cells on the retina generate nerve impulses.
  6. Impulses travel via sensory neurones in the optic nerve to the brain.
• What two parts of the eye change shape of the lens to focus light onto the retina?

  Ciliary muscles and suspensory ligaments
• What is the function of the retina in the eye?

  The retina contains receptor cells sensitive to brightness and colour of light
• What does the optic nerve do?

  The optic nerve carries impulses from the retina to the brain
• What is the sclera?

  The sclera forms a tough outer layer of the eye
• What is the cornea?

  The cornea is a transparent region at the front of the sclera
• What is the role of the iris in the eye?

  The iris controls the size of the pupil and the amount of light reaching the retina
• How do ciliary muscles and suspensory ligaments function in the eye?

  They change the shape of the lens to focus light onto the retina
• What is accommodation in the context of vision?

  Accommodation is the process of changing the shape of the lens to focus on near or distant objects
• What are the main components of the eye and their functions?

  • Retina: Contains receptor cells for brightness and color
  • Optic nerve: Carries impulses to the brain
  • Sclera: Tough outer layer
  • Cornea: Transparent front region
  • Iris: Controls pupil size and light entry
  • Ciliary muscles and suspensory ligaments: Change lens shape for focusing