Intraocular Lens Power Calculation After Double Keratorefractive Procedures: A Case Series
DOI:
https://doi.org/10.48560/rspo.32821Keywords:
Biometry, Keratomileusis, Laser In Situ, Keratotomy, Radial, Lenses, Intraocular, Photorefractive KeratectomyAbstract
INTRODUCTION: Our purpose was to report the results of intraocular lens (IOL) power calculation in patients who received two sequential keratorefractive procedures.METHODS: Biometry data were collected using IOL Master 500 and 700. Formulas available at the American Society of Cataract and Refractive Surgery (ASCRS) online calculator, PEARL-DGS and Emmetropia Verifying Optical (EVO) formulas were used.
RESULTS: Seven eyes of 6 myopic patients were enrolled. Six eyes have been submitted to radial keratotomy (RK) and laser-assisted in situ keratomileusis (LASIK) and one eye had a history of RK followed by a photorefractive keratectomy (PRK). The ASCRS formulas and PEARL-DGS for prior RK conditions were found to have the greater predictability for patients with 8 or more RK. For those with only 4 RK, the most predictable formulas were those from ASCRS for prior myopic LASIK/PRK condition and EVO and PEARL-DGS formulas.
CONCLUSION: The IOL power calculation for patients with history of keratorefractive surgery remains a challenging and there is still lack of evidence and consensus for these scenarios.
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