STANDARD VERSUS TOTAL KERATOMETRY FOR INTRAOCULAR LENS POWER CALCULATION IN CATARACT SURGERY COMBINED WITH DESCEMET MEMBRANE ENDOTHELIAL KERATOPLASTY
Published 2023
- 27th ESCRS Winter Meeting
Reference: O62
| Type: Free Paper Submission
| DOI:
10.82333/4xvr-yg62
Authors:
Jascha Wendelstein* 1
, Kamran Riaz 2
, David Cooke 3
1Department of Ophthalmology,IROC,Zurich,Switzerland;Department of Ophthalmology,Kepler university Hospital Linz,Linz,Austria;Department of Experimental Ophthalmology,Saarland University,Homburg,Germany, 2Department of Ophthalmology,Dean A. McGee Eye Institute / University of Oklahoma,Oklahoma City,United States, 3Department of Ophthalmology,Great Lakes Eye Care Center,St. Joseph,United States
Purpose
To compare the prediction accuracy of standard keratometry (K) and total keratometry (TK) for intraocular lens (IOL) power calculation in eyes undergoing combined cataract surgery and Descemet membrane endothelial keratoplasty (triple DMEK).
Setting
Tertiary care academic referral center.
Methods
Retrospective case series. Review of 83 eyes (63 patients) that underwent triple DMEK between 2019 and 2021. Biometry measurements were obtained using a swept-source optical biometer (IOLMaster 700, Carl Zeiss Meditec). 63 eyes were used for statistical analysis. Mean error, mean absolute error (MAE), standard deviation, median absolute error, maximum absolute error, root mean squared prediction error, and the percentage of eyes within prediction errors of ±0.50 diopters (D) and ±1.00 D were calculated for nine multivariable and third-generation formulas using K and TK values (Barrett Universal II, Yeo EVO 2.0, Cooke K6, Kane, Pearl-DGS, Haigis, Holladay 1, Hoffer Q, and SRK/T). Formulas were additionally tested by using the prediction for an IOL power 1D below the IOL used (IOLup1D).
Results
For all formulae, MAE was lower for K than for TK by an average of 0.21 D. The lowest MAE value observed was 0.67 D for “adjusted” SRK/T using K, and the highest MAE values observed were 1.24 D and 1.24 D for non-adjusted Hoffer Q and Haigis using TK, respectively. Overall, lower MAE values were observed for multivariable formulas and SRK/T.
Conclusion
In triple DMEK eyes, the prediction accuracy of K was higher than that of TK. The most accurate formulas were SRK/T and multivariable formulas using K with the IOLup1D adjustment.