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Li RW 2006
VAT – 3/2006
A Novel Clinical Technique to Treat Amblyopia
Dr. Roger Li BSc(Optom), PhD
Dr. Dennis Levi OD, MS, PhD, FAAO
Collaborators Dr. Pia HoenigDr. Ariella PoppleDr. Karen Young
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Li RW 2006
Vernier AcuityCan you see the misalignment?
Offset
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Li RW 2006
3AFC Pick the “odd” one out of 3
Offset
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Li RW 2006
Positional NoiseJittered Stimulus
Average Position
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Li RW 2006
Ext. Noise Levelsint N == spatial distortion
in amblyopic vision
L0 : ext N = 0
L1 : ext N < int N
L2 : ext N ≈ int N
L3 : ext N > int N
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Li RW 2006
Noise LevelsLevel 0 (STRAIGHT !!!)
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Li RW 2006
Level 1 - slightly jittered
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Li RW 2006
Level 2 - somewhat jittered
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Li RW 2006
Level 3 - VERY jittered
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Li RW 2006
Try This (32-2)
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Li RW 2006
Getting Harder! (24-3)
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Li RW 2006
Getting Harder & Harder ! (16-3)
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Li RW 2006
Getting Harder, Harder & Harder ! (12-1)
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Li RW 2006
Getting Harder, Harder, Harder & Harder ! (8-1)
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Li RW 2006
???
Modified StaircaseTriplets (up-down rules)
√√√
√√√
√√√
√√√
√√× √××
×××
√√×
Incr
easi
ng
Diff
icul
ty
Trials
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Li RW 2006
StaircaseTracking your limits
Diff
icul
t
y
Trials
Easi
er
Hard
er
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Li RW 2006
Roll down a hillPerceptual learning
Session (2-hr each)
0 10 20 30 40
Per
form
ance
Sco
re
1
10 L0L1L2L3
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Li RW 2006
Practice makes perfectExercise your BRAIN …
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Li RW 2006
Can I see better ???Improve Visual Acuity
Session
0 10 20 30 40
Vis
ual
acu
ity
(lo
gM
AR
)
0.2
0.3
0.4
0.5
0.6
0.7
0.8CrowdedUncrowded
S1 S2
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Li RW 2006
Effective & Efficient
• Intensive, active, challenging
• Enhance vision in “ 50 ” hrs
• Boost brain processing efficiency
• Decrease cortical image distortion
• Useful in adults & children with Amblyopia
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Li RW 2006
Fuuuurther Information
Li RW, Klein SA & Levi DM. (2006) J of Vis, 6, 311-321.
Chung STL, Levi DM & Li RW. (2006) Vis Res, 46, 1038-1047.
Li RW, Young KG, Hoenig P & Levi DM. (2005) IOVS, 46, 3161-3168.
Levi DM. (2005) Dev Psychobiol, 46, 222-232.
Levi DM, Li RW & Klein SA. (2005) Vis Res, 45, 1793-1805.
Li RW & Levi DM. (2004) J of Vis, 4, 476-487.
Li RW, Levi DM & Klein SA. (2004) Nat Neurosci. 7, 178-183.
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Li RW 2006
Thank you
Stay tuned to the upcoming
.……. exciting discovery
http://levilab.berkeley.edu