Edmondo Borasio Moorfields Eye Hospital Dubai Results of BESSt 2 biometry and Borasio...
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Transcript of Edmondo Borasio Moorfields Eye Hospital Dubai Results of BESSt 2 biometry and Borasio...
Edmondo BorasioEdmondo Borasio
Moorfields Eye Hospital DubaiMoorfields Eye Hospital Dubai
Results of BESSt 2 biometryand
Borasio Myopic/Hyperopic Regression (BMR / BHR)
IOL POWER CLUB IOL POWER CLUB –– 9 9thth ANNUAL MEETING – 12 Oct 2013 ANNUAL MEETING – 12 Oct 2013
© EB EYE © EB EYE 20132013
Borasio IOLMaster Regression
IOLMaster K reading(post LRS)
BorasioMyopic
Regression
BorasioHyperopicRegression
New K value New K value
SRK/T
IOL Power
Without dK adj
© EB EYE © EB EYE 20132013
(N=136)
• Myopia (N=102)
• Hyperopia (N=34)
Different IOL types; different laser platforms used.
136 eyes undergoing Phaco after Laser Ref. Sx:
Study population:
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Formulas with NO prior DATA compared
1. BESSt 12. BESSt 2 Myopia
Pentacam
IOLMaster
MYOPIA HYPERMETROPIA
1. BESSt 12. BESSt 2 Hypermetropia
1. Borasio Hyperopic Regr. (BHR)
1. Haigis-L2. Borasio Myopic Regr.
(BMR)
1. Shammas PL Myopia 1. Shammas PL Hyperopia
Other regressions
© EB EYE © EB EYE 20132013
Demographics MYOPIC LRS eyes:
K AL AConst IOL implanted
MEAN 39.10 26.96 118.70 18.26
SD 2.40 2.27 0.37 4.07
MEDIAN 38.83 26.93 118.50 19.00
MAX 44.63 34.59 119.40 30.00
MIN 34.54 20.85 118.10 2.00
© EB EYE © EB EYE 20132013
K AL AConst IOL implanted
MEAN 45.27 22.66 118.41 22.40
SD 2.59 1.20 0.05 3.91
MEDIAN 44.88 22.73 118.40 21.50
MAX 50.91 24.66 118.60 30.00
MIN 40.97 19.71 118.40 15.50
Demographics HYPEROPIC LRS eyes:
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For Haigis L, ALL constants (a0, a1, a2) were optimized
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RESULTS
© EB EYE © EB EYE 20132013
Myopic LRS
p: 0.016
p: 0.004
*
*
p: 0.000*
SD:
1.23 1.06 1.30 1.23 1.12 0.99
Note: errors at IOL plane
MAE: 0.98 ±0.91
0.92 ±0.86
1.07 ±0.73
1.23 ±0.89 1.32 ±0.79
0.69 ±0.73© EB EYE © EB EYE
20132013
Hypermetropic LRS
p: 0.002
p: 0.000
**
p: 0.000*
SD: 1.08 1.00 0.99 1.14 0.81
Note: errors at IOL plane
MAE:
0.83 ±0.69
0.99 ±0.76 1.06 ±0.60
0.83 ±0.76 0.70 ±0.48
© EB EYE © EB EYE 20132013
© EB EYE © EB EYE 20132013
© EB EYE © EB EYE 20132013
© EB EYE © EB EYE 20132013
© EB EYE © EB EYE 20132013
© EB EYE © EB EYE 20132013
18% delta
Myopic LRS
16% delta 12% delta
Note: errors at IOL plane
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6% delta
Myopic LRS - safety
Note: errors at IOL plane
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Hypermetropic LRS
9% delta
Note: errors at IOL plane
© EB EYE © EB EYE 20132013
Hypermetropic LRS - safety
9% delta
Note: errors at IOL plane
© EB EYE © EB EYE 20132013
Formula accuracy (no prior data):More accurateMYOPIA HYPEROPIA
BORASIO MyopicRegression (BMR Poly)
BESSt 2 Myopia
BESSt 1 + Std SRK/T
SHAMMAS PL Myopia
HAIGIS L (a0,a1,a2 optim)
BORASIO HyperopicRegression (BHR Lin)
SHAMMAS PL Hyperopia
BESSt 2 Hyperopia
P <0.01
P <0.01
P: 0.02
P: 0.03
© EB EYE © EB EYE 20132013
BMR/BHR: simple formula based on IOLMaster K values
BORASIO MYOPIC REGRESSION - BMR PolyMore accurate than:• BESSt 1 (p <0.001) and BESSt 2 (p: 0.033)• Shammas PL-Myopia (p <0.001)• Haigis L (p <0.001)
Lowest SD between all formulas compared: 0.99 DPotentially 30% more eyes <0.50 D compared to BESSt 2 and BESSt 1
BORASIO HYPEROPIC REGRESSION - BHR LinMore accurate than: • BESSt 1 (p <0.001)• Shammas PL-Hyperopia (p: 0.030)• BESSt 2 (n.s.)
Lowest SD between all formulas compared: 0.81 DPotentially 13% more eyes <0.50 D compared to BESSt 2, 50% vs BESSt 1
Summary
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BMR / BHR Mean Error Results:•MYOPIC LRS eyes: 0.07 ±0.99 (= emmetropia)•HYPEROPIC LRS eyes: 0.28 ±0.81 (= towards hypermetropia)
Recommendations:
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RECOMMENDATION:Best to ADD 0.25 D to the BMR Poly IOL to reduce risk of Hyperopia.Best to ADD 0.50 D to the BHR Lin IOL to reduce risk of Hyperopia.
NOTE: THE MEAN ERRORS SHOWN HERE WERE CALCULATED AT THE IOL PLANE. THE ACTUAL ERRORS AT THE SPECTACLE PLANE ARE LOWER