Korean J Ophthalmol.  2011 Dec;25(6):375-379. 10.3341/kjo.2011.25.6.375.

Accuracy of Intraocular Lens Power Calculation Formulas in Primary Angle Closure Glaucoma

• Joo J
• Whang WJ
• Oh TH
• Kang KD
• Kim HS
• Moon JI

• KMID: 1031183
• DOI: http://doi.org/10.3341/kjo.2011.25.6.375

Abstract

PURPOSE
To compare the accuracy of intraocular lens (IOL) power calculation formulas in eyes with primary angle closure glaucoma (ACG).
METHODS
This retrospective study compared the refractive outcomes of 63 eyes with primary ACG with the results of 93 eyes with normal open angles undergoing uneventful cataract surgery. Anterior segment biometry including anterior chamber depth, axial length, and anterior chamber depth to axial length ratio were compared by the IOL Master. Third generation formulas (Hoffer Q and SRK/T) and a fourth generation formula (Haigis) were used to predict IOL powers in both groups. The predictive accuracy of the formulas was analyzed by comparison of the mean error and the mean absolute error (MAE).
RESULTS
In ACG patients, anterior chamber depth and the anterior chamber depth to axial length ratio were smaller than normal controls (all p < 0.05). The MAEs from the ACG group were larger than that from the control group in the Haigis formula. The mean absolute error from the Haigis formula was the largest and the mean absolute error from the Hoffer Q formula was the smallest.
CONCLUSIONS
IOL power prediction may be inaccurate in ACG patients. The Haigis formula produced more inaccurate results in ACG patients, and it is more appropriate to use the Hoffer Q formula to predict IOL powers in eyes with primary ACG.

Keyword

Angle-closure glaucoma; Cataract; Intraocular lenses

MeSH Terms

Aged
Biometry
Cataract Extraction
Glaucoma, Angle-Closure/*complications
Glaucoma, Open-Angle/complications
Humans
*Lens Implantation, Intraocular
*Lenses, Intraocular
Middle Aged
*Optics and Photonics
Reproducibility of Results
Retrospective Studies

Figure

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  Fig. 1 Mean error (preoperative target refraction subtracted from postoperative refraction) which was produced by the Hoffer Q formula in the angle-closure glaucoma (ACG) group and the control group.

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  Fig. 2 Mean error (preoperative target refraction subtracted from postoperative refraction) which was produced by the SRK/T formula in the angle-closure glaucoma (ACG) group and the control group.

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  Fig. 3 Mean error (preoperative target refraction subtracted from postoperative refraction) which was produced by the Haigis formula in the angle-closure glaucoma (ACG) group and the control group.

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