RAY TRACING & WAVEFRONT ANALYSIS USING THE TRACEY SYSTEM Donald R. Sanders, M.D., Ph.D. Center For...
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Transcript of RAY TRACING & WAVEFRONT ANALYSIS USING THE TRACEY SYSTEM Donald R. Sanders, M.D., Ph.D. Center For...
![Page 1: RAY TRACING & WAVEFRONT ANALYSIS USING THE TRACEY SYSTEM Donald R. Sanders, M.D., Ph.D. Center For Clinical Research.](https://reader036.fdocuments.us/reader036/viewer/2022062404/551c2ef0550346ad4f8b6230/html5/thumbnails/1.jpg)
RAY TRACING &
WAVEFRONT ANALYSIS USING
THE TRACEY SYSTEM
Donald R. Sanders, M.D., Ph.D.
Center For Clinical Research
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20/10 UNCORRECTED PATIENT
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20/10 UNCORRECTED PATIENT
Retinal Spot P S F
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20/10 UNCORRECTED PATIENT
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20/10 UNCORRECTED PATIENTRef +0.04 + 0.16 X 110 Total RMS = 0.068m
Lower
Higher
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5th
Order
4th
Order
3rd Order
2nd Order
Astigmatism Defocus
(Refraction)
Higher
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Breakdown of Zernike Terms
-0.5 0 0.5 1 1.5 2123456789
1011121314151617181920
Zer
nik
e te
rm
Coefficient value (microns)
astig.defocus
astig.trefoilcomacomatrefoil
spherical aberration
2nd order
3rd order
4th order
5th order
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Root Mean Square
2 2 2 22 0 2 12 2 2 3 .......RMS Z Z Z Z
astig
mat
ism
term
defocu
s te
rm
astig
mat
ism
term
trefo
il te
rm……
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GROSS APPROXIMATIONTotal RMS Vs. Visual Acuity
1.0m = 20/20 - 20/25
0.5m = 20/15
0.25m = 20/10
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COMPONENTS OF TOTAL RMS
Lower Order Aberrations
Defocus (Sphere)
Astigmatism (Cylinder)
Plus
Higher Order Aberrations
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20/10 VISIONRef -0.14 + 0.39 X 168 Total RMS = 0.204m
P S F
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LARGELY LOWER ORDER ABERRATIONS
Retinal Spot P S F
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99% OF RMS VALUE IS LOWER ORDER ABERRATIONS
(Refractive Error)
Lower
Higher
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AFTER SUBTRACTING LOWER ORDER ABERRATIONS
Retinal Spot P S F
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REFRACTIVE ERROR
“UCVA” “BCVA”
All Aberrations Higher Order Only
P S F
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REFRACTIVE ERROR
“UCVA” “BCVA”
All Aberrations Higher Order Only
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REFRACTIVE ERROR
“UCVA” “BCVA”
All Aberrations Higher Order Only
Retinal Spot
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CORNEAL BIRTH TRAUMA
“UCVA” “BCVA”
All Aberrations Higher Order Only
P S F
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CORNEAL BIRTH TRAUMA
“UCVA” “BCVA”
All Aberrations Higher Order Only
Retinal Spot
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CORNEAL BIRTH TRAUMA
“UCVA” “BCVA”
All Aberrations Higher Order Only
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COMMON SIGNIFICANT HIGHER ORDER ABERRATIONS
Coma
Spherical Aberration
Trefoil
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(T.M.) POST LASIK Complains Of Night Glare
6mm Scan (Undilated)
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PATIENT T.M. (OD)6 mm Scan – P S F
“UCVA” “BCVA”
All Aberrations Higher Order Only
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“UCVA” “BCVA”
All Aberrations Higher Order Only
PATIENT T.M. (OD)6 mm Scan – Retinal Spot
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“UCVA” “BCVA”
All Aberrations Higher Order Only
PATIENT T.M. (OD)6 mm Scan
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PATIENT T. M. (OD)Decentered Excimer
COMA
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PATIENT T. M. (OD) Vertical
Coma
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PATIENT T.M. (OD)EFFECT OF SCAN DIAMETER
(PUPIL SIZE) ON PSFHigher Order Aberrations Only
4 mm 6 mm
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UCVA(All Aberrations)
BCVA(Higher Order Only)
PATIENT T. M. (OS)6.5mm Scan – P S F
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COMASPHERICAL
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SPHERICALABERRATION
HORIZONTALCOMA
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PATIENT T.M.NIGHT MYOPIA DUE TO
SPHERICAL ABERRATION
0
0.5
1
1.5
2
2.5
3
4 5 6 6.5
Pupil Size(Undilated)
Amount Of Myopia(D)
0.85
2.49
1.991.66
OS
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PATIENT T. M. (OS)Night Myopia Due To Spherical Aberration
4 mm 5 mm
6 mm 6.5 mm
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PATIENT T. M. (OS) – P S FNight Myopia Due To Spherical Aberration
4 mm 5 mm
6 mm 6.5 mm
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SUMMARY PATIENT T.M.Large Pupils In Dim Light
OD Vertical Coma (Decentration) With Mild Spherical Aberration
OS Horizontal Coma(Decentration) +
Spherical Aberration
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PATIENT S. P. Complains Of Severe Night Glare
6.5mm Scan Pupil is 7.0 –7.5mm Undilated
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PATIENT S. P. (OD)Severe Night Glare
4 mm 4.5 mm
6.0 mm 6.5 mm
PUPIL SIZE
RMS = 0.261 RMS = 0.407
RMS = 1.83RMS = 1.1
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PATIENT S. P. (OD)Severe Night Glare
Pupil Size
RMS = 0.166 RMS = 0.346
RMS = 1.83RMS = 0.656
Higher Order Aberration Only
4mm
6.5mm6.0mm
4.5mm
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4 mm 6.0 mm
PATIENT S. P. (OD)Severe Night Glare
Lower
Higher
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PATIENT S. P. (OS)Complains Of Severe Night Glare
4.5 mm 5.5 mm
6.0 mm 6.5 mm
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4.5 mm 6.5 mm
PATIENT S. P. (OS)Complains Of Severe Night Glare
NOTE: Scale Doubles
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PATIENT J. C.Most Higher Order Aberrations – Trefoil, Tetrafoil
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J. C. D. D.
S/P RK SURGERY