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Use of fellow eye data in the calculation of IOR lens power for the second eye
Purpose
The hypothesis that the refractive outcome of the first eye can be used to improve the intraocular lens (IOL) power calculation for the second eye
Design
Journal review
Use of Fellow Eye Data in the Calculation of Intraocular Lens Power for the Second Eye
Retrospective, consecutive case series
in a university clinic setting
Participant
Norman J. Tansuria
Harry J. Sumual
1235 patients who underwent sequential bilateral IOL implantation using the same type of IOL for both eyes.
In a subgroup of 232 eyes the actual postoperative anterior chamber depth (ACD) was measured using the Lenstar LS900 laser biometer
(Haag-Streit AG,
Koeniz, Switzerland)
Methods
Main Outcome Measures:
The refractive outcome was analyzed in retrospect
and the IOL power calculation was reviewed
using 3 different methods:
(1) the old Sanders-Retzlaff-Kraff (SRK) II formula,
(2) the newer SRK/T formula, and
(3) the more recent Olsen formula.
The error in diopters (D)
of the predicted refraction in the spectacle plane.
Results
The correlation coefficients between the prediction errors for the right and left eyes were
- 0.56 SRK II
- 0.38 SRK/T
- 0.27 Olsen formula
respectively (P<0,001).
Based on the observed correlation, the prediction of the second eye could be corrected according to the regression formula:
SRK II
Conclusions
Specific Aspects of Related Science Field
Depending on the IOL power calculation formula, the prediction error of the first eye may be used to improved the prediction for the second eye
Substituting the measured postoperative ACD of the first eye for the estimated ACD for the second eye in the Olsen formula have a similar accuracy as the empirical regression formula
Using this formula,
the mean absolute error (MAE) decrease from 0.56 D to 0.46 D, 0.47 D to 0.41 D, 0.42 D to 0.40 D
with the SRK II (P<0.001),
the SRK/T (P<0.001) and
the Olsen formula (P<0.05)
Conclusions