O3A 1 BV intro

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O3A 1 BV intro
2013-06-26 04:39:52

binocular vision
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  1. What is motor fusion?
    the ability for the eyes to move so that the images lie on corresponding points on the retina
  2. What happens when motor fusion fails?
    when the images do not lie on corresponding points, retinal disparity occurs
  3. What happens when there is a small amount of retinal disparity?
  4. What happens when theres is a large amount of retinal disparity?
    diplopia occurs- one eye may be suppressed leading to a strabismus
  5. What are ductions?
    monocular eye movements
  6. What are versions?
    BE movements where the angle between the two eyes are constant
  7. What are 2 examples of versions?
    pursuits and saccades
  8. What is a pursuit?
    smooth rotations of the eye
  9. What are saccades?
    fast abrupt movement of the eye
  10. What are vergences?
    BE movements where the angle between the eye changes
  11. which nerves innervate the eye?
    occulomotor, abducens, trochlear
  12. What muscles does the occulomotor innervate?
    • ipsi- IR, IO and MR
    • contra- SR
  13. What muscles does the abducens nerve innervate?
    • Ipsi- LR
    • contra- SO
  14. What is Hering's Law?
    • law of equal innervation
    • L and R MR are yoked
  15. What conditions disobey Hering's law?
  16. What is sherrington's law?
    law of reciprocal innervation
  17. What is sensory fusion?
    process where images on the retina of two eyes are fused in a single image in the visual cortex
  18. What is suppression?
    image of the strabismic eye is not perceived and turned off at the cortex
  19. What is simultaneous perception?
    two eye's images are not at corresponding points on the retina
  20. What is superimposition?
    two diff images but from two diff eyes on top of each other
  21. What is flat fusion?
    combining similar images but there is no depth perception
  22. Stereopsis or fusion with float?
    combination of images with depth