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All main topics / Medicine / Anatomy / TSM
there are 5 differnt forms of eye movement. define the following.
smooth pursuit
vestibulo-ocular reflex
reflex fixation of an object on the fovea
Reponse to small slowly moving target
fixation can be initiated and terminated voluntarily or involuntarily
variable speed (5 - 100° / second) reflexly maintained (involuntary eye movements)

intentional (voluntary eye movements)
reflexive (e.g direction of gaze to source of sound or moving object in peripheral field)
constant speed (800° /second)
Vision is suppressed during saccadic eye movement - Saccadic Omission
Saccades faster - if watching thrown ball following hand movenment use smooth pursuit until ball accelerates then saccades to follow the ball

The vestibulo-ocular reflex (VOR) or oculovestibular reflex is a reflex eye movement that stabilizes images on the retina during head movement by producing an eye movement in the direction opposite to head movement, thus preserving the image on the center of the visual field.

The optokinetic reflex allows the eye to follow objects in motion when the head remains stationary (e.g. observing individual telephone poles on the side of the road as one travels by them in a car). The reflex develops at about 6 months of age. [1]

A vergence is the simultaneous movement of both eyes in opposite directions to obtain or maintain single binocular vision
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Flashcard info:
Author: Peebls
Main topic: Medicine
Topic: Anatomy
Published: 26.03.2010




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