BV 1 - Intro

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Author:
sookylala
ID:
290315
Filename:
BV 1 - Intro
Updated:
2014-11-30 21:51:57
Tags:
binocular vision
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Description:
Binocular Vision
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  1. What is the diff between diplopia and confusion?
    • Diplopia - seeing one object in 2 diff places
    • Confusion - seeing 2 diff objects in the one place
  2. Why is strab a problem?
    • cosmesis/social
    • suppression if infantile
    • intermittent- asthenopia sx, diplopia
    • AC/EF
    • amblyopia
    • lack of stereo
  3. Adv of treating strab?
    • improve cosmesis
    • improve bv and stereo
    • relief of sub sx
  4. Disad of treating strab?
    • occlusion amb/strab
    • intractable diplopia
    • poor surgical results
    • rare- death during surgery
  5. ADV of treating amb?
    • improve:
    • CS
    • VA
    • bino
    • stereo
  6. Disad of treating amb?
    occlusion amb which is very difficult to treat
  7. When does suppression occur?
    • during infancy and plastic ages
    • only when both eyes are stimulated
  8. What are the 5 associated conditions with amb?
    • 1. Strab amb 
    • 2. Aniso amb 
    • 3. bilateral Iso amb
    • 4. image degredation
    • 5. Astig amb (uni/bi)
  9. Features of strab amb?
    • uni
    • cortical inhibition of input deviating eye
    • EF
    • spatial judgements abnormal
    • grating > letter VA (crowding)
    • decreased central CS at high SF
  10. Features of aniso amb?
    • Uni
    • Due to form deprivation and poor BV interaction
    • spatial judgements normal
    • CF
    • grating = letter VA
    • CS losses all over retina at all SF
  11. Features of iso amb?
    • same rx in OU
    • usually uncx astig cf high myp/hyp
    • often VA improves over time with rx
  12. What are some causes of image degredation/visual deprivation?
    • congenital cataracts
    • corneal opacities
    • complete ptosis
    • occlusion amb
  13. Other features of amb?
    • crowding
    • LP normal
    • cortical pathways dorment rather than destroyed
    • CV normal
  14. What is horror fusionis?
    • sensory adaptation to  strab
    • inability to superimpose 2 targets/fuse
    • when targets approach each other, they seem to jump to the other side

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