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20 Cards in this Set
- Front
- Back
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Suppression: active/passive inhibition resulting in loss of awareness of visual impression for one eye in monocular/binocular vision.
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Active; binocular
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T or F: physiologic suppression is normal
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T
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Suppression is active/inactive, conscious/unconscious, voluntary/involuntary.
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active, unconscious, involuntary
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How is suppression classified (what are the 5 characteristics)?
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Laterality, frequency, size, intensity/depth, and shape
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Suppression usually starts centrally or peripherally?
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centrally
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Put these tests in order of least to most dissociating.
Vectograph, Bagolini, stereoscope, red/green, red lens,freespace Is this list going shallow->deep or deep-> shallow? |
Freespace, bagolini, vectograph, stereoscope, red lens, red/green
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When would you use over corrective lenses?
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distance blur in hyperopes (infants and toddlers); overminus IXT (young pt with good accomm)
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Where do you place the seg height for a:
1. 4 year old 2. 6 year old 3. 9 year old |
1. FT mid pupil
2. FT lower pupil margin 3. FT lower lid margin |
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What are the Rx guidelines if myopes are non-strabismic:
1. <1D 2. 1-3D 3. 3-5D 4. >=5D |
1. can hold off
2. Rx if >=3yrs 3. Rx if >=1year 4. Rx at any age |
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T or F: oblique and WTR astig are more stable than ATR with increasing age
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T
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Hyperopic astig >___D assoc with strab and amblyopia...monitor closely and Rx when stable
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2.5
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For an ET, when do you Rx the full cyclopegic refraction? (what ages)
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<=5 years
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For astigmatism, what age should you Rx the full amount?
When shouldn't you correct astig? |
>=5
<2 |
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What is the goal of overcorrective prism?
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disrupt AC
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What three conditions should you NOT consider prism a a viable Tx option?
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AC, peripheral suppression, amblyopia
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T or F: you shouldn't use relieving or correcting prisms for AC patients. but cosmetic prism is ok
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T
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What position should we hold our prism bars?
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frontal plane position
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What is a disruptive prism?
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When you overcorrect an ET with AC, you cause diplopia and when the prism is removed the AC->NC. Also rotating prisms do the same thing
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T or F: a myopic Rx with cause a smaller deviation than a hyperopic Rx for ETs and XTs
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F! larger deviation
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What is the amount of prism needed to eliminate a fixation disparity?
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associated phoria
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