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Motility > Versions and Vergences > Flashcards

Versions and Vergences Flashcards

1
Q

Infranuclear Controls

A

CN 3, 5, 6 and their muscles

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2
Q

Nuclear Controls

A

Cranial nuclei

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3
Q

Supranuclear Contros

A

higher order; plans and controls eye movement

cortex, cerebellum, brainstem

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4
Q

Versions and Vergences are controlled by….

A

supranuclear pathway

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5
Q

Saccades

A

FAST conjugate eye movement for refixation/
moves fovea to object of interest
voluntary, some can be reflex

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6
Q

Saccade- Version or Vergence?

A

Version

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7
Q

Saccade Latency

A

time between stimulus and response

120- 200ms

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8
Q

Saccades develop by age…

A

1

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9
Q

Pursuits

A

maintains fovea focus on a slowly moving target
matches eye velocity to target velocity
voluntary

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10
Q

Pursuit Latency

A

shorter than saccades- faster start

125ms

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11
Q

Pursuits develop by…..

A

3-4 months

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12
Q

Vestibulo-ocular Reflex

VOR

A

stabilize retinal image during brief head movements
seen in doll’s head maneuver
does not require stimuli

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13
Q

VOR is developed by….

A

Horizontal- at birth

Vertical- later

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14
Q

Vestibular damage results in….

A

horizontal nystagmus

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15
Q

Dolls Head Maneuver

A

eyes move opposite to head turn

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16
Q

Caloric Testing

A

head angled 30 degrees
Cold = opposite
warm = same

17
Q

Optokinetic Reflex

A

takes over after brief head movement/ VOR

during prolonged head movement

18
Q

Testing Optokinetic Reflex

A

Rotational Testing

eye moves fast opposite rotation of chair

19
Q

Optokinetic Nystagmus

OKN

A

slow purusit eye movement followed by fast corrective saccade
head stays still
requires input from visual system

20
Q

OKN develops by…..

A

3-5 months

21
Q

Pursuits- Version or Vergence?

22
Q

VOR- Version or Vergence?

23
Q

Optokinetic Reflex- Version or Vergence?

24
Q

OKN- Version or Vergence?

25
Q

Fusional Vergence

A

to correct discrepancies b/t retinal images /

make sure both eyes see the same thing

26
Q

Tonic Vergence

A

constant inn to EOMs when awake and alert

holds eyes straight since eyes would otherwise diverge

27
Q

Proximal Vergence

A

induced convergence to view objects at near

28
Q

High AC/A

A

ET with accommodation

eyes overconverge

29
Q

Low AC/A

A

XT, harder to converge or cant converge

Motility (9 decks)

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