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Predictability and accuracy of IOL formulas in high myopia

Poster Details

First Author: A.saif EGYPT

Co Author(s):    P. Saif              

Abstract Details

Purpose:

To study the Predictability and accuracy of different intraocular lens calculation formulas in high myopia patients with axial length(AL) ≥26.0 mm or spherical equivalent (SE) refraction more than 6 diopter undergoing phacoemulsification.

Setting:

Multicenter study in Beni Suef University hospital, Fayoum university hospital and MUST hospital in Egypt

Methods:

the study comprised 215 eyes of patients presented with cataract divided into group A : with AL ≥ 26 mm and group B: with AL more than 26 mm. All eyes had SE refraction more than 6 diopter. Immersion ultrasound A-scan technique and auto-keratometry. The IOL power calculated using the Haigis, SRK-T, Holladay, Hoffer-Q, Binkhorst and SRK-II formulas.. Analyzing the differences between actual postoperative refraction and target refraction by different formulas. P value < 0.05 considered statistically significant.

Results:

The Mean age was 54.0 ±8.0 years and 54.0±11.0 years for group A& B . The mean AL was 27.69 ±2.42 mm. The average k reading was 44.82 ±1.82 and 43.63±2.74 . the pre SE -9.78±3.24 D & -12.5±4.21 D (from -5.5 – 22.38 D). the mean error were Haigis -0.46 ±0.58 D&+0.12±0.73D, Holladay -0.34 ±0.83 D &0.66±0.77D , SRK/T -0.23 ±0.60 D & 0.24±0.80 D , Hoffer-Q 0.01 ±0.76 D & 0.69±0.74D, Binkhorst 0.07 ±0.78 D & 0.69±0.73 and SRK-II -0.45±0.74D & - 0.46 ±1.56 D.

Conclusions:

Haigis formula showed the best result in myopic eyes with axial length more than 26 mm while SRK-II shows the best in axial length less than 26 mm. FINANCIAL DISCLOUSRE: NONE

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