The eye

• what is accommodation?

  the process of changing the shape of the lens to focus on near or distant objects
• to focus on distant objects

  1. the ciliary muscles relax
  2. the suspensory ligaments are pulled tight
  3. the lens is pulled thin and only slightly refracts light rays
• to focus on near objects

  1. the ciliary muscles contract
  2. suspensory muscles slacken.
  3. the lens is thicker and refracts strongly.
• what is hyperopia?

  long sighted
• what is myopia?

  short sighted
• how can you correct myopia?

  concave lens
• how can you correct hyperpia?

  convex lens
• why does myopia occur?

  the image focuses in front of the retina because the lens is too strong or eye ball is too long
• why does hyperopia occur?

  image focuses Behind the retina because he lens is too weak or eyball too short
• If the pupil is bigger it has dilated as in dim light the pupil dilate as the radial muscles contract and the circular muscle in the iris relax