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Every Airman a Force Multiplier 1 Cone Contrast Test Aerospace Ophthalmology USAF School of Aerospace Medicine 711th Human Performance Wing Cone Contrast Test (CCT)
description
Color vision info. air force test. small overview points. powerpoint. official. This is a small PowerPoint overview of the new con contrast test that the Air Force has begun using to test applicant for positive color vision.
Transcript of Cone Contrast Background
Every Airman a Force Multiplier
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Cone Contrast TestAerospace Ophthalmology
USAF School of Aerospace Medicine711th Human Performance Wing
Cone Contrast Test (CCT)
Every Airman a Force Multiplier
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Hereditary color deficiency 8% of males1 in 200 females
Current tests detect presence of color deficiencyFew tests detect
Type (red, green, blue)Severity of deficiency
Introduction
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Based on normal color visionLetters visible to single cone typeIn decreasing steps of visibility(cone contrast)Lowest visiblecone contrast
Cone Contrast Test
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Quantifies normal color visionType & severity of hereditary deficiencyAcquired color loss in eye disease
Cone Contrast Test
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Red Cone Contrasts
1 V Z N F U2 F V N H P3 R P F D U4 Z E D H P5 H R P E D
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Green Cone Contrasts
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1 H V R N F2 D R E Z U3 N Z V E P4 Z E D N F5 H R P E D
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Blue Cone Contrasts
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1 D R E Z U2 F V N H P3 R P F D U4 N Z V E H5 H R P E D
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Hereditary Color Deficiency
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1 V Z N F U2 F V N H P3 R P F D U4 Z E D H P5 H R P E D6 D R E Z U
1 V Z N F U2 F V N H P3 R P F D U4 Z E D H P5 H R P E D6 D R E Z U
1 V Z N F U2 F V N H P3 R P F D U4 Z E D H P5 H R P E D6 D R E Z U
Normal perception Red deficiency
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Hereditary Color Deficiency
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Normal perception Green deficiency
1 H V R N F2 D R E Z U3 N Z V E P4 Z E D N F5 H R P E D6 F V N H P
1 H V R N F2 D R E Z U3 N Z V E P4 Z E D N F5 H R P E D6 F V N H P
1 H V R N F2 D R E Z U3 N Z V E P4 Z E D N F5 H R P E D6 F V N H P
1 H V R N F2 D R E Z U3 N Z V E P4 Z E D N F5 H R P E D6 F V N H P
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CCT Detects Color Deficiency
0 4
0
25
50
75
100
Cone Contrast Test
CCTScore
Red Green Blue
Hereditary Color Deficiency
mean
+3SD
-3SD
NormalsRed deficientGreen deficient
NormalsRed deficientGreen deficient
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CCT Grades Color Performance
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0 10 20 30 40 50 60 70 80 90 100
CCT Score (right Eye)
CCT Score (left Eye)
> 2SD
Normal upper right quadrant
75
75
Green deficiency (n=183)Red deficiency (n=43)Normals (n=92)
In color deficiency and in normals
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Acquired Color Deficiency:Eye Disease
Visual Pathway
NormalsRetinaOptic Nerve
Red Green Blue
CCT in Eye Disease
Acquired Color Deficiency
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25
50
75
100
CCTScore
Cone Contrast Test12
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N
V
R
E
U
ZZ Single letter
CCT Different
(random)sequence each time
Prevents memorization
Automated CCT
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Brief Demo of Netbook CCT
Pre-calibrated Netbook with CCT programUser friendly; patient responds with mouseRapid staircase to threshold; automatic scoring
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Use Mouse to Select the Letter You See; Computer-Voice Reports Your Response; Letter contrast decreases with
correct response; increases with incorrect response
CCT Task
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Program Continues until Red, Green and Blue Tests are given to Right Eye and then Left Eye
(just follow the prompts)
CCT Task
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Recent CCT Results
Red Deficient
GreenDeficient
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CCT Calibration VerificationUser is Prompted Weekly
When prompted, Plug Spyder3 into Netbook USB Port; Place Spyder3 on Measuring Area as Shown; Select Start; Program will require 3-5 minutes
to check calibration and re-calibrate if not within tolerance.
