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ORIGINAL ARTICLE
Year : 2015  |  Volume : 16  |  Issue : 1  |  Page : 10-15

Accuracy of corneal power measurements for intraocular lens power calculation after myopic laser in-situ keratomileusis


Department of Ophthalmology, Faculty of Medicine, University of Alexandria, Alexandria, Egypt

Correspondence Address:
MD Mohammad A.M. El-Hifnawy
Department of Ophthalmology, Faculty of Medicine, University of Alexandria, Alexandria
Egypt
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/1110-9173.157780

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Purpose The aim of the study was to evaluate the accuracy of corneal power measurements for intraocular lens (IOL) power calculation after myopic laser in-situ keratomileusis (LASIK). Setting The study was conducted at the Faculty of Medicine, Alexandria University, Egypt. Patients and methods The study was conducted on 45 eyes that had undergone myopic LASIK previously. Corneal power was measured using manual keratometry, automated keratometry, IOLMaster, and Pentacam. Different hypothetical IOL power calculation formulas were used in each case. Results The steepest mean K value with manual keratometry (37.48 ± 2.86 D) followed by automated keratometry (37.31 ± 2.83 D) and the IOLMaster mean K value (37.06 ± 2.98 D) were steeper than any other mean K value measured by Pentacam. Using 4 mm Holladay equivalent K reading (EKR) with the double-K SRK/T formula, the refractive outcome was good, with 97.8% of cases within ± 2 D, 80.0% of cases within ± 1 D, and 42.2% of cases within ± 0.5 D. The best combination of formulas was 'Shammas-PL+double-K SRK/T using EKR 4 mm'. Conclusion Pentacam Scheimpflug imaging using EKR at 4 mm improved the accuracy of IOL power calculation in post-LASIK eyes. The best option is a combination of formulas. It is recommended to use the mean of the combination of 'Shammas-PL+double-K SRK/T with EKR 4 mm'.


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