Characteristics of Accommodation and Vergence Responses
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18 Terms
Latency of far→near accommodation?
300–400 ms
Why is near→far slower?
Passive relaxation + vitreous constraints
Does reaction time depend on step size?
No
Does response time depend on step size?
Yes – larger steps take longer
Maximum tracking frequency?
~0.8 Hz
What happens to gain as frequency increases?
Decreases
What happens to phase lag as frequency increases?
Increases
Best stimulus condition?
Blur + size + chromatic cues
What is accommodative lead?
Overaccommodation at distance
What is accommodative lag?
Underaccommodation at near
What determines gain?
Slope of stimulus-response curve
Latency of vergence step response?
150–200 ms
Two components of vergence Step Response?
Transient (predictive) + Sustained (feedback)
Is early vergence open or closed loop?
Open-loop
Gain at ~1 Hz?
~0.5
Effect of adding size cues?
Improves gain, reduces lag
Three miniature eye movements?
Drift, microsaccades, micronystagmus
Why are miniature eye movements important?
Prevent retinal fading