Eye Movements I & II Flashcards
There’s a kind of eye movement called pursuit. What is it?
Dr. Caldwell refers to this as “foveating.” It is the act of putting both foveas on an object to track it.
Describe the type of eye movement called saccade.
Rapid and ballistic movements – which can be as fast as 700° per second – during which visual input to the cortex ceases.
While reading, we focus on a point and see ______ letters to the left and ________ letters to the right. We move about eight letters at a time.
4; 15
Explain the movement patterns of nystagmus.
Nystagmus means slow movement one direction (say, left), followed by rapid, saccadic movement in the opposite direction (so, right)
Nystagmus is described as either ___________ or ___________.
right-beating (fast right); left-beating (fast left)
The pupils ___________ during convergence.
constrict
Smooth pursuit can go as fast as ___________.
50° per second
Saccadic eye movements are controlled by what nucleus?
The frontal eye field (FEF)
The vestibular-ocular reflex can be tested by ____________.
asking someone to fixate on a point and then rotating their head
Rapidly jerking eye movements are called _____________.
opsoclonus
Opsoclonus does not result from ___________.
brain or nerve damage; it is a paraneoplastic disorder
Know the difference between INO and MLF lesions.
Ok!
The fovea covers about ______ of the visual field.
5°
Why do the pupils constrict during accommodation?
To increase depth-of-field
The ____________ drives the saccadic eye reflex.
superior colliculus
