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Q: What are the four basic models of vision care?
Q: what are skeffington's four circles?
- = vision (where all 4 meet) - higher order processing
Q: what is antigravity
Space localization / orientation
Q: what is centering
- Determine distance from body based on convergence
- Cyclopean eye
Q: what is identification?
- Identify dominant features of objects
- Requires accommodative response
Q: what is speech-auditory?
- Required to name objects seen
- Stored in memory for later recall
Q: what npd manifestations are usually symptomatic?
Flight (sympathetic) response
Q: what is sheards criterion?
Compensating vergence should be 2x the phoria amount
Q: what is percival's criterion?
Pt's phoria should be in the middle 1/3 of fusional vergence range
Q: what is fixation disparity?
- Small misalignments of eyes are measured in minutes of arc
- Can generate forced vergence
- Measured under true binocular conditions
- Best way to prescribe prism
Q: what are the advantages to fixation disparity?
- True binocular conditions
- Best way to determine Rxed prism
Q: what are the disadvantages of fixation disparity?
Only tests FD, doesn't take motility into consideration
Q: what tests are used for NFV
- Smooth vergence
- Step vergence
- Vergence facility (BI prism)
- Binocular accommodative facility (minus lenses)
Q: what tests are used for accommodative system?
- Monocular flippers
- NRA / PRA
Q: what are the tests for motor alignment?
- Von-graph (step vergence)
Q: up until what age are you able to perform o-scope and ret while they are sleeping
Q: after what age could you start to use phoropter on children?
Q: when can you expect reliable responses from subjective tests?
4 yo +
Q: what age range should you be able to perform phorometry?
Q: at what point should you expect reliance on subjective test to be adult-level?
Q: what is the exam schedule for kids
- 1st exam @ 6mo then yearly or every 2 years
- Full assessment before entering kindergarden
Q what do duction, versions, and vergence mean?
- Duction: one eye movement
- Versions: two eyes move same direction
- Vergence: two eyes move opposite direction
Q: on which eye do you use prisms on krimsky tests
On fixating eye
Q: what SA test is required for truck drivers?
Random dot E
Q: what color test is required for military, firefighters, and policemen?
Q: what type of fusion does worth 4 dot test?
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