Eyeball :3

• What happens during near vision (accommodation)?

  • Ciliary Muscle Contracts
  • Zonular Fibers relax
  • Lens becomes more round
  • Refraction increases
• What happens in distance vision (accommodation)?

  • Ciliary Muscle Relaxes
  • Zonular Fibers contract
  • Lens become more flat/oval
  • Refraction decreases
• Accommodation

  A) Near Vision

  B) Distance Vision

  
• What is the function of the iris?

  Creates color w/ melanocytes and hold muscle that changes pupil size
• What does sphincter pupillae do?

  Narrow opening when contracted
• What does the dilator pupillae do?

  Dilates pupil
• What innervates the sphincter pupillae?

  Oculomotor Nerve
• What innervates the dilator pupillae muscle?

  sympathetic nerve
• What is the pupil and how does it relate to the iris?

  Pupil allows light into the eye and the iris helps control the muscles that change the size of the pupil
• What does the retina do?

  Picks up light
• What do rods do?


  detect light, there is NO color
• What do cones do?

  Detect color
• What does fovea centralis do?

  Sharp central vision- only cones
• Optic disk?


  Blind spot- no rods or cones.
• Trace a photon of light reflecting from an object into the eye and back to the visual center of the brain where it registers as vision?

  • Conjunctiva
  • Cornea
  • Anterior Chamber
  • Pupil
  • Posterior Chamber
  • Lens
  • Vitreous Body
  • Fovea Centralis
  • Cones
  • Optic Nerve
  • Optic Tract
  • Visual Cortex of Brain