Dynamic Improvements in Visual Functionafter the Tenotomy and Reattachment Procedure:

Model Predictions and Patient Data

L.F. Dell'OssoL.F. Dell'Osso1-31-3, Z.I. Wang, Z.I. Wang1,31,3, and S. Prakish, and S. Prakish11

The Daroff-Dell’Osso Ocular Motility LaboratoryThe Daroff-Dell’Osso Ocular Motility Laboratory11 – Louis Stokes – Louis Stokes Cleveland Department of Veterans Affairs Medical Center and Cleveland Department of Veterans Affairs Medical Center and

CASE Medical School, Departments of NeurologyCASE Medical School, Departments of Neurology22 and and Biomedical EngineeringBiomedical Engineering33, Case Western Reserve University, , Case Western Reserve University,

Cleveland OH; USACleveland OH; USA

—“Will T&R Prevent Missing the Bird”

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Human DataHuman DataBad Target Timing = Poor Target AcquisitionBad Target Timing = Poor Target Acquisition

Half SpeedHalf Speed

Lt > 2 sLt > 2 s

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Human DataHuman DataGood Target Timing = Fast Target AcquisitionGood Target Timing = Fast Target Acquisition

Half SpeedHalf Speed

Lt ~= 0.8 sLt ~= 0.8 s

Also: Good Pursuit Gain!Also: Good Pursuit Gain!

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Human DataHuman DataSame Patient, Different Pursuit Gains vs. DirectionSame Patient, Different Pursuit Gains vs. Direction

Half SpeedHalf Speed

Lt > 2 sLt > 2 s

Bad Pursuit Gain = Poor Target AcquisitionBad Pursuit Gain = Poor Target Acquisition

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Human DataHuman DataEye Switching Contributes to Longer LtEye Switching Contributes to Longer Lt

Half SpeedHalf Speed

Lt ~= 1 sLt ~= 1 s

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INS + Strabismus = Poorer Target AcquisitionINS + Strabismus = Poorer Target Acquisition

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Model SimulationModel SimulationT&R Broadens and Improves NAFX and T&R Broadens and Improves NAFX and

Lowers Target Acquisition TimeLowers Target Acquisition Time

Half SpeedHalf Speed

Lt ~= 1 sLt ~= 1 s

Bad Target Timing Still = Poorer Target AcquisitionBad Target Timing Still = Poorer Target Acquisition

fsfs

Steady-StateSteady-StateErrorError

Fast Target Acquisition, Good Pursuit, Fast Target Acquisition, Good Pursuit, VOR, & Eye-Hand CoordinationVOR, & Eye-Hand Coordination

Copper Hunting 2000Copper Water Trial 2000

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Seeing Faster Improves Seeing Faster Improves Visual Function and is Visual Function and is

Necessary for Most Necessary for Most Activities in a Full Life Activities in a Full Life

T&R means seeing MORE, BETTER, and FASTER, but...

I may still miss the bird!

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