Accuracy and predictability of intraocular lens power calculation after laser in situ keratomileusis

¹Gimbel Eye Centre, Calgary, Alberta, Canada. hvgimbel@gimbel.com

Journal of Cataract and Refractive Surgery

|April 20, 2001

Abstract

Purpose:

To study the accuracy and predictability of intraocular lens (IOL) power calculation in eyes that had laser in situ keratomileusis (LASIK).

Setting:

Gimbel Eye Centre, Calgary, Alberta, Canada.

Methods:

Refractive outcomes in 6 cataract surgery and lensectomy eyes after previous LASIK were analyzed retrospectively. Target refractions based on measured and refraction-derived keratometric values were compared with postoperative achieved refractions. Differences between target refractions calculated using 5 IOL formulas and 2 A-constants and achieved refractions were also compared.

Results:

The refractive error of IOL power calculation in postoperative LASIK eyes was significantly reduced when refraction-derived keratometric values were used for IOL power calculation. Persistent residual hyperopia still occurred in some cases; this was corrected by hyperopic LASIK. Refractive results appeared more accurate and predictable when the Holladay 2 or Binkhorst 2 formula was used for IOL power calculation.

Conclusion:

Hyperopic error after cataract surgery in post-LASIK eyes was significantly reduced by using refraction-derived keratometric values for IOL power calculation. Persistent hyperopic error was corrected by hyperopic LASIK.

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Purpose:

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Conclusion:

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