How do you measure eye movement?
All types of eye movement responses are easily measured using a modernized computerized eye tracker, including VOR, visual fixation, smooth pursuit, nystagmus, and saccades.
What are the 6 eye movements?
You are now familiar with the 6 cardinal directions of gaze (right/up; right; right/down; left/up; left; left/down), as well as the remainder of the yoked eye movements (straight up; straight down; convergence). Click on the following link for a great interactive eye simulator to practice what you know.
What do saccades measure?
Relationships between amplitude, peak velocity and duration Saccades show consistent relationships between their size, speed and duration. Thus, the bigger the saccade, the greater its peak velocity and the longer its duration (Becker, 1989).
Are movements of attention faster than eye movements?
The object-based theory of attention predicts that attention should shift between locations more quickly when in pursuit of a moving object. Our results support this theory. Attentional pursuit is substantially faster — taking only 200–250 ms to cover the same distance.
What does an eye power of 6 6 indicate?
If you achieve a vision measurement of 6/6, this means that you can see at a distance of 6m what an average person also sees at the same distance.
How to analyze fixation eye movements in Amblyopia Patients?
Thus, to analyze fixation eye movements in amblyopia patients, it is important to evaluate the waveforms for the presence of nystagmus. Since BCEA is a dispersion measure of eye position, it depicts the spread of eye position around the fixation point but does not reflect how fast the eyes are moving.
Is fixation stability better under monocular viewing conditions?
The fixation stability was better under both eyes viewing condition than monocular viewing conditions in normal subjects as measured by BCEA. This was also reflected by smaller fixational saccade/quick phase amplitude and disconjugacy and smaller eye position variance and lower drift velocity.
Do fellow and amblyopic eye conditions affect reading and visuomotor task performance?
Thus, we have found several eye movement abnormalities in the fellow and amblyopic eye evident under both eyes viewing condition that could contribute to difficulties with reading and visuomotor task performance as has been reported in amblyopia patients ( 46, 47). Fixational Eye Movements as a function of waveform and type of amblyopia
Do stereopsis and visual acuity affect composite amplitude of fast eye movements?
In the current paper, we found that both visual acuity of the amblyopic eye and stereopsis had effects on composite amplitude of fast eye movements of fellow and amblyopic eye under both eye viewing and amblyopic eye viewing conditions.