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The clinical efficacy of Haigis formula using A-scan contact ultrasound biometry

Poster Details

First Author: J.Lee SOUTH KOREA

Co Author(s):                  

Abstract Details

Purpose:

To investigate the accuracy of the Haigis formula compared to other formulas using contact ultrasound biometry.

Setting:

Department of Ophthalmology, School of Medicine, Pusan National University & PNUH, Pusan. South Korea

Methods:

This study was performed on 91 patients, 110 eyes who underwent cataract surgery in our hospital. Axial length (AXL), Anterior chamber depth (ACD) were measured with both A-scan and IOL Master. Patients were divided into 3 groups based on AXL; Group I (AXL<23.0mm), Group II (23.0mm≤AXL<26.0mm), Group III (AXL≥26.0mm). Before cataract surgery, predicted refraction was calculated using the Haigis, SRK/T, Hoffer Q, and Holladay 1 formulas with both A-scan and IOL Master measurements. Mean absolute error (MAE) were analyzed at 1 month after surgery among various IOL formulas.

Results:

Using contact ultrasound biometry, in Group I, MAE of Haigis was 0.84 ± 0.64D and was significantly lower than only SRK/T. In Group II, MAE of Haigis was 0.71 ± 0.53D and was significantly the lowest MAE compared to all other formulas. In Group III, MAE of Haigis was 0.76 ± 1.13D and no significantly different from other formulas. Comparing MAE of A-scan to IOL-Master, Haigis formula showed 0.18D higher error and it became lower when AXL is close to normal range.

Conclusions:

Using contact ultrasound biometry, the Haigis formula still provided the best predictability of postoperative refractive outcome compared to all other formulas in the eyes of normal axial length.

Financial Disclosure:

NONE

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