PT  - JOURNAL ARTICLE
AU  - Veronika Röggla
AU  - Achim Langenbucher
AU  - Christina Leydolt
AU  - Daniel Schartmüller
AU  - Luca Schwarzenbacher
AU  - Claudette Abela-Formanek
AU  - Rupert Menapace
TI  - Accuracy of common IOL power formulas in 611 eyes based on axial length and corneal power ranges
AID  - 10.1136/bjophthalmol-2020-315882
DP  - 2021 Dec 01
TA  - British Journal of Ophthalmology
PG  - 1661--1665
VI  - 105
IP  - 12
4099  - http://bjo.bmj.com/content/105/12/1661.short
4100  - http://bjo.bmj.com/content/105/12/1661.full
SO  - Br J Ophthalmol2021 Dec 01; 105
AB  - Aims To provide clinical guidance on the use of intraocular lens (IOL) power calculation formulas according to the biometric parameters.Methods 611 eyes that underwent cataract surgery were retrospectively analysed in subgroups according to the axial length (AL) and corneal power (K). The predicted residual refractive error was calculated and compared to evaluate the accuracy of the following formulas: Haigis, Hoffer Q, Holladay 1 and SRK/T. Furthermore, the percentages of eyes with ≤±0.25, ≤±0.5 and 1 dioptres (D) of the prediction error were recorded.Results The Haigis formula showed the highest percentage of cases with ≤0.5 D in eyes with a short AL and steep K (90%), average AL and steep cornea (73.2%) but also in long eyes with a flat and average K (65% and 72.7%, respectively). The Hoffer Q formula delivered the lowest median absolute error (MedAE) in short eyes with an average K (0.30 D) and Holladay 1 in short eyes with a steep K (Holladay 1 0.24 D). SRK/T presented the highest percentage of cases with ≤0.5 D in average long eyes with a flat and average K (80.5% and 68.1%, respectively) and the lowest MedAE in long eyes with an average K (0.29 D).Conclusion Overall, the Haigis formula shows accurate results in most subgroups. However, attention must be paid to the axial eye length as well as the corneal power when choosing the appropriate formula to calculate an IOL power, especially in eyes with an unusual biometry.