the eye

• what happens to the iris when looking at distant objects?

  fat and round
• what happens to the iris shape when looking at a near object?

  thin and flat
• what happens to the ciliary muscles when looking at a distant object?

  contract
• what happens to the ciliary muscles when looking at a near object?

  relax
• what happens to the suspensory ligaments when looking at a distant object?

  slack
• what happens to the suspensory ligaments when looking at a near object?

  tight
• circular muscles

  
• radial muscles

  
• iris: a ring of muscle that controls the size of the pupil to protect the rods and cones
• in bright light, circular muscles contract to make pupil smaller
• in dim light, radial muscles contract to make pupil bigger