Ocular Motility

Front 1

Hering's Law

Back 1

Yoked Muscles (OD-LR, OS-MR)

Front 2

Sherrington's Law

Back 2

This law states that the EOM's of the same eye are divided into agonist & antagonist

Front 3

Which eye movement has the least latency (Saccades, Pursuits, Vestibular, Vergence)?

Back 3

Vestibular (15msec)

Front 4

Which eye movement has the longest latency (Saccades, Pursuits, Vestibular, Vergence)?

Back 4

Saccades (200msec)

Front 5

Which eye movement has the slowest velocity (Saccades, Pursuits, Vestibular, Vergence)?

Back 5

Vergence (10deg/sec)

Front 6

Which eye movement has the fastest velocity (Saccades, Pursuits, Vestibular, Vergence)?

Back 6

Saccades (1000deg/sec)

Front 7

VOR response tires after ____ sec of head movement.

Back 7

This eye movment reflex tires after 30 of sustained head movement.

Front 8

Spasmus Nutans is characterized by what 3 non-voluntary movements?

Back 8

This disorder is characterized by what 3 non-voluntary movements: nystagmus, head nodding, and head turn.

Front 9

Nystagmus is often seen with these three congenital conditions.

Back 9

It is often seen with these three conjenital conditions: albinism, aniridia, achromatopsia

Front 10

Describe the movement seen in latent nystagmus

Back 10

The velocity and/or amplitude of this nystagmus increases when one eye is occluded

Front 11

The nasal to temporal OKN response is absent in infants untill age ____ months

Back 11

This resonse is absent in infants untill age 3-4 months

Front 12

Saccades are controlled primarily by which area of the brain?

Back 12

This eye movement is controlled primarily by the contralateral frontal eye field and damage to this area can result in eye movement towards the side of the lesion.

Front 13

Define saccadic supression

Back 13

During this eye movement, vision is suppressed

Front 14

Pusuits are (voluntary/involuntary) and are controlled by what part of the brain?

Back 14

This eye movement is voluntary and is controlled by the ipsilateral parietal lobe.

Front 15

The three principal causes that result in the eyes not working as a team:

Back 15

This problem is usually caused by decompensated phoria, anatomical restriction, or innervation problems

Front 16

An decompensated phoria usually results in what kind of deviation (comitant/noncomitant)?

Back 16

This type of phoria usually results in a Comitant Deviation

Front 17

An anatomical restriction or a muscle palsy results in what kind of deviation (comitant/noncomitant)?
?

Back 17

This often results in a noncomitant diviation

Front 18

A positive forced duction test means what?

Back 18

If this test is positive it mean the eye resists you pulling on it with forceps

Front 19

General rule: for a patient with a head tilt, the face typically points (away/towards) the muscle action of the affected muscle?

Back 19

Towards

Front 20

What causes Duanes Retraction Syndrome?

Back 20

This condition is caused by abnormal deviation of CN6 and lateral rectus innervation by CN3

Front 21

All 3 types of Duanes Retraction syndrome have what 2 symptoms?

Back 21

No matter the type of this disorder, globe retraction and narrowing of the palpebral fissure is always present.

Front 22

Duanes Retraction Syndrome type 1 is the most common, what is the cheif sign of this syndrome?

Back 22

This results in limited Abduction (1d) and the need to Ddx CN6 palsy.

Front 23

What causes Brown's Syndrome and what signs are present?

Back 23

This syndrome is characterized by problems with the SO muscle or the trochlea. Signs include limited elevation during adduction and small hypertropia in primary gaze.

Front 24

Park's 3-step (step 3)

Back 24

If the Hyper is worse when you tilt the head to the ipsilateral side, it's caused by an oblique muscle.