Eye movements
5 important questions on Eye movements
Why do we make eye movements?
- The retina had a variable resolution; only fovea permits high-resolution color vision
- Motion of the image on the retina blurs our vision. Thus, we need to stabilize the retinal image
Describe the three types of eye movement
- Saccades
Scanning movements where the gaze is abruptly shifted from one point to the next. There is no visual feedback possible during a saccade.
- Vergence
Cooperative movements that keep both eyes fixed on the target in depth (convergence or divergence).
- Pursuit
Smooth tracking movements that keep an object's image fixed in place on the retina.
What is an optokinetic relflex (OKR)?
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What is a vestibulo-ocular reflex (VOR)?
Describe the saccade kinematics
- Larger saccades last longer
- Larger saccades have higher peak velocities
- Relation between amplitude and duration
- Relation between amplitude and peak velocity
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