Structure of the eye

• Ciliary body:

  • contains ciliary muscles
  • responsible for changing shape of lens
• Suspensory ligaments:

  • attached to lens
  • controls thickness of lens
• Pupil:

  • hole that allows light to enter eye
  • changes size
• Iris:

  • contract and relaxes to form pupil
  • responsible for how much light enters eye
  • contains radial and circular muscles
• Lens:

  • flexible structure
  • transparent
  • refracts light
  • focuses light onto retina
• Sclera:

  • protects
  • maintains shape of eye
• Retina:

  • contains rods and cones
  • converts light into impulse
• Fovea (yellow spot):

  • highest point of visual acuity
• Blind spot:

  • no rods or cone
  • area where optic nerve leaves eye
• Optic nerve:

  • transfers impulse to cerebrum
• Choroid:

  • filled with blood vessels
  • provides nutrients to eye
  • absorbs excessive light