Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2003 Nov;29(11):2063-8.
doi: 10.1016/s0886-3350(03)00957-x.

Intraocular lens power calculation after corneal refractive surgery: double-K method

Jaime Aramberri  1
Affiliations

Intraocular lens power calculation after corneal refractive surgery: double-K method

Jaime Aramberri. J Cataract Refract Surg. 2003 Nov.

Abstract

Purpose: To determine the accuracy of a method of calculating intraocular lens (IOL) power after corneal refractive surgery.

Setting: Department of Ophthalmology, Hospital de Gipuzkoa, San Sebastián, Spain.

Methods: The SRK/T formula was modified to use the pre refractive surgery K-value (Kpre) for the effective lens position (ELP) calculation and the post refractive surgery K-value (Kpost) for IOL power calculation by the vergence formula. The Kpre value was obtained by keratometry or topography and the Kpost, by the clinical history method. The formula was assessed in 9 cases of cataract surgery after laser in situ keratomileusis (LASIK) or photorefractive keratectomy (PRK) in which all relevant data were available. Refractive results of the standard SRK/T and the double-K SRK/T were compared statistically.

Results: The mean IOL power for emmetropia and the achieved refraction (mean spherical equivalent [SE]), respectively, were +17.85 diopters (D) +/- 3.43 (SD) and +1.82 +/- 0.73 with the standard SRK/T and +20.25 +/- 3.55 D and +0.13 +/- 0.62 D with the double-K SRK/T. No case in the standard SRK/T group and 6 cases (66.66%) in the double-K group achieved a +/-0.5 D SE.

Conclusion: Double-K modification of the SRK/T formula improved the accuracy of IOL power calculation after LASIK and PRK.

PubMed Disclaimer

Comment in