Transcript Dynamic Improvements in Visual Function after the Tenotomy and

Dynamic Improvements in Visual Function
after the Tenotomy and Reattachment Procedure:
Model Predictions and Patient Data
—“Will T&R Prevent Missing the Bird”
L.F. Dell'Osso1-3, Z.I. Wang1,3, and S. Prakish1
The Daroff-Dell’Osso Ocular Motility Laboratory1 – Louis Stokes
Cleveland Department of Veterans Affairs Medical Center and
CASE Medical School, Departments of Neurology2 and
Biomedical Engineering3, Case Western Reserve University,
Cleveland OH; USA
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Human Data
Bad Target Timing = Poor Target Acquisition
Half Speed
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Lt > 2 s
Human Data
Good Target Timing = Fast Target Acquisition
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Lt ~= 0.8 s
Also: Good Pursuit Gain!
Human Data
Same Patient, Different Pursuit Gains vs. Direction
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Lt > 2 s
Bad Pursuit Gain = Poor Target Acquisition
Human Data
Eye Switching Contributes to Longer Lt
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Lt ~= 1 s
INS + Strabismus = Poorer Target Acquisition
Model Simulation
T&R Broadens and Improves NAFX and
Lowers Target Acquisition Time
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Lt ~= 1 s
Steady-State
Error
fs
Bad Target Timing Still = Poorer Target Acquisition
Fast Target Acquisition, Good Pursuit,
VOR, & Eye-Hand Coordination
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Copper Water Trial 2000
Copper Hunting 2000
T&R means seeing MORE, BETTER, and FASTER, but...
are
are
Seeing Faster Improves
Visual Function and is
Necessary for Most
Activities in a Full Life
I may still miss the bird!