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Accuracy of IOL formulas in high myopia

Poster Details

First Author: P.Saif EGYPT

Co Author(s):    m. Saif   A. Saif   S. Safina              

Abstract Details

Purpose:

To study the accuracy of different intraocular lens calculation formulas in high myopia patients with axial length ≥26.0 mm or spherical equivalent refraction more than 6 diopter who are undergoing phacoemulsification.

Setting:

A prospective comparative study in Beni Suef University Hospital, Fayoum University Hospital, and Misr University Hospital, Egypt.

Methods:

215 eyes of patients presented with cataract with axial length ≥ 26 mm or spherical equivalent more refraction than 6 diopter. Axial length measurement using immersion ultrasound A-scan technique, and auto-keratometry for K readings were done. The IOL power was calculated using 6 formulas, namely the Haigis, SRK-T, Holladay, Hoffer-Q, Binkhorst and SRK11 formulas. Refraction was 6 weeks after surgery. Differences between actual postoperative refraction and target refraction using the different formulas were analyzed. P < 0.05 was considered statistically significant.

Results:

The mean axial length was 27.69 ±2.42 mm . The mean average k was 43.93 ±2.61. The Mean preoperative spherical equivalent (SE) of the patients was -11.8 ±4.15 D. After surgery mean error in Haigis formula results was -0.03 ±0.74 D, SRK/T formula was 0.11 ±0.79 D, Holladay formula was 0.41 ±0.90 D, Hoffer-Q formula was 0.52 ±0.80 D, Binkhorst formula was 0.53 ±0.79 D and SRK11 formula was- 0.46 (±1.39) D.

Conclusions:

Haigis formula showed the best result in high myopic cataractus eyes with minimal shift to myopia and SRK11 show the worse one.

Financial Disclosure:

NONE

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