Dr. Eskina FOZ Presentation ESCRS
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Transcript of Dr. Eskina FOZ Presentation ESCRS
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7/25/2019 Dr. Eskina FOZ Presentation ESCRS
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Erika N. Eskina, MD1
,Victoria Parshina1,Olga Mironenko, PhD1
Yuri Kolmakov1
Samuel Arba-Mosquera, PhD2,*
(1) Laser Surgery Clinic SPHERE, Moscow, Russi
(2) SCHWIND eye-tech-solutions, Kleinostheim, Germ
FINANCIAL DISCLOSURE:
The authors have no financial or proprietary interest in a product, method, or material described.Dr. Arba Mosquera and Thomas Magnago are employees of SCHWIND eye-tech-solutions.
Aspherical optical zones:
The effective optical zone with the Schwind
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Purpose:To evaluate the functional optical zone (FOZ) and influencing parameters among eyes that u
treatments for myopic astigmatism with PRK , TransPRK or LASIK.
Settings:
Prof. Erika N. Eskina, MD, Laser Surgery Clinic SPHERE, Moscow, RussiMethods:
16 patients (32 eyes) treated with
16 patients (32 eyes) treated with
16 patients (32 eyes) treated with LASIK using Pendular microkeratome (SCHWIND eye
using the SCHWIND AMARIS flying-spot excimer laser system (SCHWIND eye-tech-solutionsix-month.
We analysed the influence of the following parameters:
OZ Planned, FOZ preop, K readings in 4 mm zone preop, SPH inputted, CYL inputted, pachy
of the cornea, age and type of operation
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Parameters and Statistics
Clinical outcomes were evaluated in terms of functional optical zone (FOZ), eff
zone (EOZ), planned optical zone (POZ),
POZ=Optical zone selected in the software where the full amount of refractive
applied.
FOZ = defined as the area (diameter) where the RMS HO value exceeds 0.50D th
search starts from the center to the periphery of each map).
EOZ = post-op FOZ
Multilinear regression analyses started with full degrees of freedoapplied stepwise regression
a P value less than 0.05 was considered statistically significan
We also used Ordinary least square method, Mann-Whitney U-t
Coefficient of determination (R2) and Wilcoxon signed-rank te
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Group description
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RESULTS - Optical Zone
The level of significance in difference in OZ postOp and planned TransPRK and PRK g
For PRK and LASIK groups is 9%
For LASIK and TransPRK is 68% (not significant at all)
OZ PostOp OZ Planned OZ PreOp
Planned OZ
deviationChange of OZ
postop
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P
POZ deviation in a relation to ablation depth and E
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POZ deviation in a relation to K readings and EOZ
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RESULTSEOZ (planned) deviation in TransPRK Grou
Scattergramm represents the reduction in the effective OZ in majority of
3
4
5
6
7
8
9
1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31
OZ,mm
CASES
OZ plan OZ post OP
3
4
5
6
7
8
9
3 4 5 6
OZpostOP
OZ plan
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RESULTSEOZ (planned) deviation in PRK Group
3
4
5
6
7
8
9
1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31
OZ,mm
CASES
OZ plan OZ post OP
3
4
5
6
7
8
9
3 4 5 6
OZpostOP
OZ plan
Scattergramm represents the reduction in the effective OZ in all cas
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3
4
5
6
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8
9
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
OZ,mm
CASES
OZ plan OZ post OP
3
4
5
6
7
8
9
3 4 5 6
OZpostOP
OZ plan
RESULTSEOZ (planned) deviation in LASIKGroup
Scattergramm represents the reduction in the effective OZ in majority of
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Multip
an
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EOZ planning
EOZpostOP = 3.144 + 0.688*OZ0.170*OZpreOP
i + 0.393*SPH
i + 0.17
0.003*PACHi0.058*K2i0,008*Agei+ 0.0.461*D2i
where:
OZplanOZ planned, PACHpachymetry in the center of the coreading in the flat meridian;Agepatient age; D1is a binary pathere is a PRK planned,0if there is other type of surgery plann
binary parameter =1 if there is a TransPRK planned, 0 if there issurgery planned
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EOZ planning
C
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Conclusion The results of the analysis offer us a possibility to make a real planning of OZ postop and incr
optics for patienrs operated
The mathematical modeling of the factors, which influencing the EOZ could be described by th
EOZpostOP = 3.144 + 0.688*OZplan + 0.170*OZpreOPi+ 0.393*SPHi+ 0.
0.003*PACHi0.058*K2i0,008*Agei+ 0.319*D1i+ 0.461*D2
Take home message:
Decreasing of EOZ means only higher, than was planned, level of aberr
ablation
EOZ decreasing with increasing a level of myopia and astigmatism.
Planning an additional 1 mm OZ you should input at least for PRK 1,13 m
1,09 mm and for LASIK 1,06 mm
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Thank you for your kind attention