Estimation of IOL optic power calculation refractive results with the use of different formulae in extremely long eyes: preliminary report

Session Details

Session Title: Presented Poster Session: Cataract Surgery Special Cases

Venue: Poster Village: Pod 1

First Author: : M.Kremeshkov RUSSIA

Co Author(s): :    A. Ulyanov   E. Titarenko   A. Lizunov                 

Abstract Details

Purpose:

To estimate refractive results of IOL optic power calculation results in patients with high myopia in extremely long eyes (AL over 28 mm) using standard (Holladay II and Haigis) and modified (Barrett and Holladay II with Wang-Koch correction) formulae for cataract phacoemulsification or refractive lens exchange.

Setting:

IRTC Eye Microsurgery Ekaterinburg Center, Ekaterinburg, Russian Federation.

Methods:

We performed a retrospective analysis of a case series including cataract phacoemulsification or refractive lens exchange in extremely long eyes in patients with high myopia from 2016 to 2018. The study included 52 eyes (44 patients). Preoperative measurements were performed with IOLMaster 700 optical biometer (Carl Zeiss Meditec, Germany). Patients were implanted with MN60MA (Alcon) and Aspira-aAy (HumanOptics) lenses. Primary result was the comparison of mean error between the four formulae in two groups corresponding to implanted IOLs. A comparative analysis was performed, the significance of difference was calculated.

Results:

The formulae were ranged by groups and mean error ± standard error of the mean. In MN60MA group (n=22) error value made1,5 ± 0,26 D for Holladay II, 0,23 ± 0,26 D for Holladay II + WK, 0,67 ± 0,25 D for Haigis, 0,49 ± 0,24 D for Barrett II. In Aspira-aAy group (n=30) the error was 1,24 ± 0,17 D for Holladay II, 0,11 ± 0,21 D for Holladay II + WK, 0,8 ± 0,22 D for Haigis, 0,74 ± 0,18 D for Barret II. The difference of absolute errors between the formulae was significant (P <0.001).

Conclusions:

Most accurate prediction of post-op refraction was demonstrated by Holladay II + WK formula, followed by Barrett II Universal and Haigis. These formulae should be used in implantation planning and preoperative IOL power calculation in patients with axial length over 28 mm.

Financial Disclosure:

None