Practice Questions Flashcards
Neurological control of eye movements consist of a
Pulse and a step
The king decvick test can be administered by ___.
A parent
King devick is best administered when
There is a baseline prior to the accident to see the change
King devick testing can occur ___ after.
Months after suspected injury to evaluate recovery
In eye movements, the pulse is
Responsible for overcoming the viscosity of the orbit
What keeps the eye in the new position
Step
Command for lateral eye movements are initiated by
Contralateral FEFs
VOR has the ____ latency.
Shorter latency
Nystagmus can be only
Pursuit eye movements
Can also be only saccade movements
I missed my train that is moving from my left to my right. My nystagmus will
Be leftward (left beating/fast) Have a slow phase to the right
Eye movements are said to be made about an axis on
Listings plane
The center of rotation of eye movements is
Really not a single point
Center of rotation is point of ___ velocity during eye movement
Zero
Movement of only left eye in any direction is a
Duction
What EOM has toe closest insertion point
Medial rectus
EOM that passes through the trochlea
Superior oblique
What muscles mostly elevate or depress the eye when reading
Inferior and superior obliques
A purely down gaze places the eyes in a
Secondary position
Unlike the SR and IR, the obliques
Elevate or depress when reading
When the left eye is moving to the left what will be the agonist?
The LLR
Antagonist muscles pull the eye
Away from desired position
It is best if the eye movement recorder is
Not on the patient’s line of sight
Shows linearity over a large range
Can disregard head movements
In recording eye movements, we know that recording can only be accurate if
We tailor the measuring device ti the type of eye movement being measured
Most likely to use if measuring very small amplitude eye movement (seconds of arc) such as fixational eye movements.
Electro magnetic coil (has better resolution)
Which are used in clinical settings to measure eye movements
Direct patient observation (most used)
And EOG
EOG can be used to
Measure vertical eye movements
Measure in some clinics
Infrared limbal reflection is
Not usually used to measure vertical eye movements
Ramp is less than ___ more than ____
Less than a pulse more than a step
3 types of eye movements
Pursuits, saccades, vergence
To make a saccadic eye movement you need
A pulse followed by a step
To make a saccadic eye movement the eyes must
Overcome the resistance within the orbit, then maintain the new position
To make a pursuit eye movement, the eyes must
Slowly move from where they are now, to the new position
A target is located 10 degrees to the left, The signal to the muscles will be
A VELOCITY signal to move the eye 10 degrees to the left
